Well, some people have both and I think that is why they try to treat the question of bipolar first.

Drugs don't "cure" PTSD, they do help to protect the brain. I found that when I had therapy it helped me a great deal. It sounds like your symptoms are from the PTSD, I was so up and down with it like you are discribing, and the ups were not manic, they were "flight" from triggers and stress.

I am sorry you are struggling so much right now ((Hopeful Camel)), I think a therapist specializing in trauma work can help (make sure the T is experienced though). You are always welcome to come to this forum and vent or ask questions for support anytime.