I think a lot of people don't find a magic formula, although meds can be very helpful especially with bipolar is my understanding. Do you think your therapists were helpful at all? If not, maybe it was the type of therapy or therapist? I had a couple of therapists that I found were just not a good fit and the type of therapy was not helpful. In fact, I was like what is the point of this? Now I feel more hopeful with the right therapist.
The diagnosis for me was not that helpful in and of itself, although I do know that I cannot handle antidepressants now and I did learn to pay attention to my moods which has been helpful. I am not on medication, but will reconsider it if it gets too difficult without it for me. I hope you find a treatment that helps and am sorry you are struggling so much!