Hi Lozz,
I'd like to join screechowl and welcome you to the BPD Family.
You have a double whammy ... .mom with BPD traits and a Wedding (stressful for even the most healthy mothers and daughters ) It's no wonder you're exhausted.
You've made a good choice to reach out for help, counseling can help in the "real world" and we can give support here too.
Feelings of guilt are part of the "FOG"-Fear, Obligation & Guilt (emotional blackmail) that many of us with pwBPD (people with BPD) in our lives find ourselves swallowed up by. You are not alone. Here is a link to more information on FOG for you to check out
https://bpdfamily.com/content/emotional-blackmail-fear-obligation-and-guilt-fogYou have also touched on an important tool when dealing with your mom and that is boundaries. Boundaries are key to expressing what is acceptable to you and what is not and pwBPD are masters at pushing and testing boundaries . The key is
sticking to your boundaries and this I know is difficult to do particularly with a parent. It's made more difficult at the moment because you are probably already busy and stressed with your wedding plans. Below are some links to more information on boundaries... .
https://bpdfamily.com/bpdresources/nk_a120.htmhttps://bpdfamily.com/content/values-and-boundariesPart of the puzzle here too, is for you to take care of yourself. Try to create some down time, take a deep breath and relax for just a little while. Lean on your fiance and friends too I'm sure they want to help.

I also want to point out the "Lessons" links in the box to the right --------------------------------->
for some additional information.
Congratulations on your upcoming wedding I know you will have a lovely day
Panda39