What Causes Spells Of Dizziness Followed By Increased Energy Level?

Q: Hello. around four weeks ago the night before i went snowboarding i stayed up till around 1 o clock. not abnormal for me. However, when i was going to sleep the room starting getting darker, and my brain felt as if it were spinning, with a headache to boot. I passed this of as anxiety/apprehension and eventually got some sleep, but the next day while waiting in the lift line i started to get bouts of dizziness and blackness. I fought it off for some time, however eventually i passed out again and broke the retaining wall to the left of me. The curious part of the whole thing is that directly after i get a burst of energy (adrenalin) and have no abnormal feelings whatsoever. I continued snowboarding all day after being checked out by a ski patrol and eating without any problems whatsoever. Again, i left it to be dismissed as the slight cold i had that had been going around. However last night, (when im lying down i dont get the nauseous feeling) i saw the shadows moving in my room and it happened exactly like the last time at night. besides these occurences, ive had headaches that are off and on, sleepiness/tiredness (not to an extreme amount but noticeable) and a pressure as if my brain were too big for my head that is central to the forehead. Also i have 4-5 times had my hearing go out slightly, in both ears, then come back. I d like to note that there is no pressure under an eye and therefore i would believe it is not a brain tumor. any help would be greatly appreciated. -Derek Edgington