I really feel for you. We have all been in the same situation before we were diagnosed.
A good pdoc will assess your history. Be as open and honest as you possibly can. They are not there to judge you.
Just don’t be fooled into thinking that there is some magic pill that will make you all better. You will need more than that. You should also start therapy, which can make a huge difference in how you feel by talking about your life experiences and how they have affected your current mental state.
Even if you were to start meds, some may not work; you will have to start out with small dosages that may not work at first. It’s a lot of experimentation before you can get a good balance. So make sure you are doing ALL that you can to get yourself balanced on a long-term basis. Good luck!