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.