I went through the same things when I started. Over time, I've been on it for 2 and half years now and my weights fine. In the beginning I lost 20 pounds in 3 months. My parents thought I had an eating disorder, but I really just wasn't hungry. It's now evend out and my weights normal, and the mood swings have gotten much better. For me it was just getting my body use to it for a while.