Hi blemc

I shared a somewhat similar situation about 15 yrs ago when my father had already been diagnosed with Lewy Bodies - a form of dementia, and my mother was unable to cope. He was in his 70’s, and she in her late 60’s at the time. Your paragraph about all the things you hate struck a chord with me, because my mother was treating my father terribly, due to her inability to cope.
Rather than going into details of what it felt like for me, let me just say that a lot of us here have experienced something similar to what you are going through. It feels so out of control and aweful and kind of hopeless.
I can say that as aweful as it is, eventually that situation will pass. You may wonder or feel like you don't know how you will get through it, but you will - and eventually the situation will unfold and evolve, and pass.
It sounds like you are already putting measures in place to increase supports- as did we. I can’t emphasize enough the importance of self-care. You say you cant withdraw for at least two weeks, but if you are experiencing crying every second day I think its very important to up your self care right now.
You are already way ahead of where I was because you already have a T, and lots of strategies for working with ubpd mom, whereas 15 yrs ago I had none of those things. Despite this, it sounds like you are still struggling, so self care = self preservation. You wont be as effective at helping your family if you are unwell yourself.
I have recently downloaded an app called Headspace (recommended by my T), because although my dad passed away 14 years ago, I still have my ubpd mom who is now 83 and out of control. Like you, I was doing well with the self care, but sometimes the self care we are doing is no longer enough, and we need to add more self care. Do whatever works for you - massage, a walk, time with a friend away from the situation?
Just do more of it.
Also - set boundaries. I am learning to do this now.
I hope the situation with your grandmas health and your moms behavior shows some progress sooner rather than later.
When I was going through this with my dad and ubpd mom 15 yrs ago, I also informed dads case worker of moms behavior. You’ve probably already done this , but if not, it might be something to think about to advocate for your grandma. Maybe it’s time for assisted living for her, to keep her and orher family members safe from your moms behavior? And maybe it would also help us your mom, although she might be unable to accept that...? Just thinking out loud ...not sure if it could apply to your situation .
Take care of yourself. I’m feeling for you.
