Well, chemistry is a very interesting science and because you have been on medications, I suppose that there is a chance you'll realize which medications are made from what as you study.

I'm very sorry you had such a bad experience with Lithium. Is there any way you can turn your thought process on it's head? For example, now that you are studying chemestry, you are more knowledgeable about things that go into your body. So now you know the very formula of the thing that was bad for you! That gives you strength over it, and it's no longer this lurking monster. You know how it is made, you know how to disect it so that it's no longer Lithium Carbonate, but just some chemicals. It has no power over you.

Sometimes the best way to beat the monster is to realize it has no power over you.