Hey peeps. I'm a 24 year old male. I just got my first diagnosis yesterday. They say that currently I'm in hypomania. I also have a bipolar father and had a bipolar grandfather. It feels weird. Kind of gratifying that it wasn't me being an incompetent piece of shit all these years.

Could this be a wrong diagnosis? Should I get a second opinion? I did have a very weird last couple of weeks which the doc says was hypomania. 

My symptoms were- being irritated by people, fighting all the time, troubled by the slightest sound on tv or a phone call, being extremely talkative, crying randomly in between, unable to do basic tasks at my IT job, unable to do things which were so simple. Having a cloudy memory, being unable to plan my day and do things in a systematic order. Getting worried by simplest of things.
I keep wondering if it was just severe anxiety? I have always felt most of these things in my life (although in a lesser degree).

The doctor says that since I have had 2-3 depressive episodes (undiagnosed) in college and have a strong family history with this disorder, everything points to me being Bipolar.

I have been put on lithium and clonazepam. I love playing the drums. Will I be able to play them on meds? I'm a fun loving person who always travelled and met new people. Will I be able to do all that? I've seen my dad on bpad meds and he just seems devoid of energy most of the times.
I know this could all be my denial.