hello Surviving,
I see you're fairly new to the group so let me say welcome to the group. As you've been finding out no one here will judge you because we've been where you are, some are still on their own BPD journey. This is your journey ... .it will be filled with plenty of pot holes and speed bumps & you will stumble from time to time. But the group will alway be here to support you with a helping hand up so you can take the next step on your own journey.
I'm sorry that you're not sleeping well ... .it's common. I found that Melatonin helped me out a great deal in the beginning. NOT to worry it's NOT a drug. It's a natural body supplement that you can find in the vitamin isle at the grocery store. In the beginning I was taking 40mg's ... .not I'm at 5mgs.
It's all about taking better care of
YOU~! I see that you're planning on seeing a therapist and as most if not every NON in the group will tell you ... .a therapist is a big key in your own BPD journey. If you & your therapist come to find out that you are suffering from some sort of PTSD from your exBPD then I would suggest a treatment called EMDR. It helped me and many others in the military with our own PTSD ... .regardless what caused your PTSD like a horrific car accident, sexual assault trauma, or any other number of things. your therapist will help you find out why you are the NON aka Codependent that you are ... .low self esteem and help you on that journey of discovery too. How can't you know where you're going if you don't know where you came from?
Come here as often as you need to, but come here as often as you
WANT too. Someone from the group will be here to help you pick you up, dust you off then it's up to you to take the next step on your BPD recovery journey. As you say, it's important to
"FOCUS ON YOU" ... .
YOU are responsible for
YOUR happiness. Do
NOT let the happiness of someone dictate your happiness. It's a tough lesson to learn for a NON but it can be learned.
Some things in regards to your exBPD ... .if he threatens suicide again ... .I would call emergency services. BPD is a Very Serious Cluster B Mental Illness that has the highest suicide rate of mental illnesses. So a threat is not to be taking lightly. If nothing else, depending on where you live he might be on a 24-72 hour hold to watch at the hospital. He might finally get the help he needs to some degree. BPD isn't really curable ... .the best anyone can hope for is some level of "management" of the symptoms. But it's limited in scope and only if the BPD will continue with therapy for decades & or pharma.
KNOW THAT THIS IS NOT YOUR FAULT~! Nothing
YOU said, or didn't say, Nothing
YOU did or didn't do caused him to have this mental illness or his behavior. People with BPD have learned throughout their life to be very manipulative to get what they need if only for a short period of time. As I said BPD is a VERY serious Cluster B Mental Illness. The best way I've come to learn about BPD is that the Neuro-highways in the brain just don't connect to where they need to go. Like off ramps on a freeway that stop at the end of the ramp and connect to nothing. There are many studies that have concluded that the brain is physically damage although there are different reason why some believe this ... .but many mental health professionals will tell you that they are very seriously broken people.
I would read some of the really good resources here on the sight to learn about BPD terminology and behavior. I would also read a couple of books to start with, " The Human Magnet Syndrome" & "Stop Walking on Eggshells". You can find both at your local library or maybe your therapist might let you barrow them ... .or you can find them rather inexpensive on the web.
Some other things to suggest to
"Help YOU take better care of YOU". Exercise ... .go for a walk ... .a mile will take you 15-20 minutes on a slow pace & you can do 3 miles in just an hour! This will help you burn off the stress that is causing havoc on your mind, body & soul. It also burns off those empty calories you've been putting in your body.
Next start eating better. Fix a salad for dinner & listen to some really good music while you fixing it. Get your humor back too~! Humor & laughter are great for healing the mind, body & soul. Go to a funny movie with a friend or get a couple of friends and go to a comedy club.
Those are just a couple of things to get you started on taking care of
YOU. 
Come back here as often as you want too ... .someone from the group will always be there to answer a question or to vent too. Let us know what YOU are doing for YOU~! Let us know what kind of salad you had, or how long you walk was or what movie you went to see.
Until then ... .here are a couple of videos for you to watch & learn ... .
sending hugs ... .
J
This one is motivational ... .you might not think it applies to you ... .but it really does in some way, shape or form ... .
Even the most confident & motivated person will need a helping hand at some point in their life"https://www.youtube.com/watch?v=_ZQeMv5PXhg&t=94sThis one will let you know it's ok to grieve you loss ... .
The most important life lesson I've learned is this ... .sometimes people leave ... .and sometimes unexpectedly ... .take a deep ... .mourn the loss and start living again."https://www.youtube.com/watch?v=BsIYlgrov3k&t=6sAnd this one is just funny as hell ... .I still laugh till I cry watching it.
https://www.youtube.com/watch?v=G_Z3lmidmrYI listen to this song most every morning in the shower ... .it gets me moving & get me started for my day. It should be the NON's anthem ... .
https://www.youtube.com/watch?v=cAFl2D8j8cM&list=RDMMcAFl2D8j8cM