Suggest Treatment For Headache After Injury

Hello! I hit my head on a shelf 2 days ago, and it wasn't too hard, but it wasn't too soft either. It hurt very mildly for only a few moments. The next evening, I had a mild headache, and I've had a mild on and off headache since this afternoon and I kind of feel weird, sort of sick (I also have major seasonal allergies), but I can't tell if it's my anxiety that is making me feel weird or my head. My head doesn't hurt that much *now*, in fact, barely at all. I can't tell if I feel weird because it's late and I'm sleepy or if it's something else :s Also, I keep checking my pupils with a flashlight and they react normally. It's hard to tell with my left eye because my pupil is a bit misshapen as a result of amblyopia, but it also contracts normally. Do I really need to get checked out further by a doctor or can I just relax about this?

Thanks ^-^