For the most part when I take Ritalin, I'm fine. I can focus, I feel more confident in my abilities, and I'm more ambitious. However, I always get an anxiety attack or two. I only take one 20 mg pill a day and about 30 mins to an hour in, I start gagging and feel like throwing up. I call it an anxiety attack, but I dont really know what it is. Mentally, I dont start freaking out or anything. My body just has this strange physical reaction, I think when it first starts absorbing the medication. Has anybody else experienced this? Any explanation for it? It can be embarrassing when I'm around people because I'll suddenly stop mid-sentence or walking, and just dry heave repeatedly for about a minute until I stop, and then I go back to being normal.