I think you have reason to talk to a therapist or a psychiastrist (pdoc). It could be bipolar, could be something else and could just be "you".

I always suggest people check out www.psycheducation.org to learn more about bipolar if they are interested. It's written by a psychiatrist who specializes in BP and was very helpful in realizing I had bipolar and what that looked like for me. I still check in there occasionally when I need information and I've been diagnosed for over 20 years.