I'm a 21 year old male, and for the last 3 weeks, I have had a sporadic headache that flares up at seemingly random intervals. I can usually sense one coming on, as my vision flashes dark around the edges. These headaches are accompanied by a tingling sensation in my hands, and seem insensitive to normal, over the counter treatment options (e.g. Tylenol). They also induce a feeling of heavy-ness, like my head is about to pop, as well as a throbbing/stabbing pain. I started getting them around Friday, July 30th, seeing a doctor the next week who told me it was a sinus infection. Neither or the two medications he prescribed alleviated the problem whatsoever. Just so I rule everything out, I feel it is necessary to say that I fell down some steps on Friday, August 6th, which re-aggravated an old back injury. My first tingling sensation on Sunday, August 8th, induced an anxiety attack, at least according to the ER doctor I saw. After I calmed down, my blood pressure and heart rate were both exceedingly normal. I had an EKG to make sure that it wasn't a heart attack or anything. Since then, I've been put on Darvocet-N and Diclofenac. It seems as though neither dulls the pain at all. There also seems to be no obvious trigger, as light/sound/etc. have no effect. Any ideas on what it could be?
Also, I have no history of headaches at all.