if it's any consolation, I didn't decide what I wanted to do career-wise until 28. Last year. Sometimes it takes living life and gaining experience knowledge (wisdom, basically) before you can decide what you want to do with your life, or what you're meant to do with your life.
I'm think now that I might even want to add animals into my major.

Keep things in the back of your mind, but don't dwell on them, or try not to. I know it's difficult. I'm an anxious person and tend to lose sleep over a lot, but lately I've had to slow myself down because I was LOSING my mind. There comes a point where you'll just break enough and you'll set a different pace for yourself. Trust me.[;)] Just try to get some sleep. I'm glad you're feeling better.