Hi, I'm a 45 year old male that has decided to try Medicinal Marijuana to treat my anxiety and pain from severe arthritis. I was taking a lot of ibuprofen and Xanax. I used to be a heavy pot smoker in my teens and early 20's. I stopped for a number of years and only occasionally took a puff. I got my medical card and picked up some hybrid sativa/indica blends. Smoked a small amount and felt great at the time. Very relaxed and no anxiety. In the morning i started to develop a headache like sensation at the base of my skull. I didn't smoke that night, but had a little the next. I've now had this pain in the area of my cerebellum for 3 days. I have not taken any pain medication. (trying to stop taking it so often) Never have i experienced such a strange sensation, certainly doesn't seem normal. I know that anxiety can do crazy things to the body, but i honestly dont feel anxious at all. The brain doesn't have pain receptors and i'm pretty sure there's no sinus back there. Thought maybe it was a tension type headache with my neck so i sat in the spa for an hour. It doesn't get any better when i work out either?? Any idea what this could be?