How many classes are you taking? What I have found to be extremely helpful is to step aside from the direction I'm going for just a little bit. When you're not in class, find some activity that will calm your mind, even if it's just a while. I know this probably doesn't apply, but I can take a break and go to my house in the country (that's not what it sounds like, I'm not rich) and work on it. There is always something that needs to be done. Maybe you can find a friend or a relative who needs help with something they are doing. Maybe you can find some side activity through the school that you really like, say working as a volunteer in some organization or something like it. Anything that will derail the mania train for a while. You will probably find that you are much less tempted to radically change the direction of your life. Your manic energy is being directed somewhere else.

Just a thought.