JustWannaDisappear I was diagnosed at 31, but have had symptoms since I was 8. My diagnosis came when I was found attempting and I was committed to a Psychiatric Hospital for major depression. By the 2nd week I was manic.
Prior to me being diagnosed, the hypomania normally presented as me being highly driven. It could also turn into irritability. I explained away the depression as burnout.
I would suggest tracking your mood. I use this online tracker
http://www.medhelp.org/land/mood-tracker When you refer to a therapist is this a Psychiatrist? If it isn't I would suggest speaking to a Psychiatrist. It's also important to be completely honest with your doctor(s). I suffered in silence and told no one how I was feeling. Learn from my mistake.