Hey, so you've mostly described your mom's problems and symptoms, but none of your own. So I think worrying about being crazy is a little premature! Other than your worries, you haven't described any mood swings, delusions, sleep problems, etc. Sounds pretty normal so far...

But what Confusedinomicon suggests about finding a counselor is a good idea. Regardless of anything else, it might help you out to talk it through with a professional. And if it gives you peace of mind, you can get an evaluation for bipolar. There are online quiz versions as well, if you're really worried about whether you're showing any symptoms, but obviously you should go to a professional for diagnostic services.