Age has a factor. They claim BP can't be accurately diagnosed til after 18. but if my math is right and you're 27 now, I myself don't understand why your pdoc couldnt come up with something by now. I was diagnosed at 20 and on the first day of treatment. Maybe it was because I was sooooo manic it was all too obvious for him. Def. tell your pdoc to consider the idea. he/she may be able to look back and find a pattern that could bring him/her to a more conclusive decision.