It depends ... if you're looking right at a light source in a dark room, yeah. Photosensitivity isn't so much about the brightness as about the contrast.
Weed increases your heart rate and blood pressure somewhat. Usually this will cause you to flush and become warm and sweat, not become pallid and cold and lose blood in your extremities.
I think you either experienced a placebo effect stemming from your expectations, a panic attack (sometimes happens with marijuana) or a toxic effect of some sort (say, the dealer dusted the buds with methamphetamine to boost his sales by giving it some kick and addictive properties, or the grower contaminated it with fertilizers, or the guy who rolled it decided to add some crack or something).
Also, you say you had been smoking for a few months. This isn't long enough to build up alot of tolerance to nicotine, and if your marijuana was mixed with tobacco, you're inhaling it deeply and holding it in your lungs (presumably), which isn't done with cigarettes. This could cause nicotine poisoning