Follow-Up: I have not been on dexedrin very long. In fact, today is only my second day taking it. However, I have taken two similar prescriptions for my ADHD (adderall & concerta), that had the same affects on me. I'm not sure about dexedrin, but with the other two medications, my nervous habits faded after about 3 or 4 weeks. However, I still haven't regained my normal appetite, I just have to make myself eat. Once you have a little food in your system the feeling of nausea fades. You just have to make yourself take that first bite. It should get better soon once you get more accustomed to it, but if not, there are many alternatives. Best of luck!