I am a first year med student and last night I shadowed an ER doc in the trauma center for the first time and came extremely close to passing out while I was observing an accident victim w/ a massive head wound get stitched back together. I have observed surgeries before with no problem, but last night, my vision got all blurry and then had black spots, I turned white, and got really sweaty and dizzy. Is this common for a MSI, or should I just drop out of med school now? It was definitely and ego-blowing experience and I don't know how to prevent this from happening again. Does anyone have any input?