Last night around 6pm I ate a plain cheese pizza that i brought from aldi. Around 3am i was awake with severe stomach pains and felt nauseas. I then went really hot and had diarrhea really bad (almost like thick gravy) sorry for the tmi!! I instantly felt better (just sore and battered) and then came out in mild hives all over my face which were starting to spread.. I put a cold compress on and they dissapeared within 1 hour?