Hi cat31203120
Welcome.
It's normal to feel lost after a relationship of 4 years. I think that's true even if the relationship involved a lot of conflict. I would encourage you not to let the closeness of the breakup to your seeking help discourage you. Seeking help is one of the most important steps some people take. It's hard to feel and understand that at this time, but I'll share with you that it's very true.
I support your decision to get help. There's a lot of things you mention that would signal to many people that help is something good to be considered.
I encourage you to work with a suitable T or P. Because you're on a site to support people involved in a relationship with a person with BPD, I encourage you to look at someone with a specialty around these areas, e.g., DBT. Regardless of diagnosis, people in these relationships find that the support a T or P can provide while they work through the issues is helpful.
The site's acronyms are here.
https://bpdfamily.com/message_board/index.php?topic=26601.msg427962#msg427962I hope you find peace.