This actually sounds very much like bipolar II hypo-mania to me! Especially your second post. Please remember you don't have to have ALL of the symptoms at one time, or ever, really.
http://psychcentral.com/disorders/sx21.htm My best suggestion is to see a Psychiatrist about this, because a GP is not best suited to diagnose or treat this disorder. Also, if the GP thinks you are severely depressed and you are actually bipolar, medications used to treat depression alone can actually CAUSE a manic episode.