Running extremely rough and cylinder 1 misfire

I was driving home from work and the check engine light started flashing at me and the car all of a sudden started running extremely rough. It idles rough but gets worse as you drive. The whole car was shaking so bad I didn't think I would be able to get it home. I had it scanned and it read there is a cylinder 1 misfire. My boyfriend also said he thought it smelled like rotten eggs but wasn't positive. I don't know much about cars but was hoping someone could give me some places to start looking at first. I have only had this car for two months and the family member that gave it to me said he changed the spark plugs and oil recently and that I should check the distributor but I'm not sure how much he actually knows about cars. Any advice would be greatly appreciated!