First off, my mom's boyfriend was raised vegetarian from the age of four on up. When he moved out of the orphanage (it was a 7th day advonist ran orphanage, aperantly), he decided to convert to being an omni, because he wanted to be able to just go anywhere and eat anything. He said that at first he felt sick and hated the tast of meat. Eventually, he got use to it, but he said that it took a long time. However, he was veg for at least 15 years. (and he's so wonderful to me! He's making a seperate dish of vegan stuffing for me to eat at thanksgiving!)
I don't know if it would have affected you after two months or not. If you had been super careful (unlike me) after going veg, and havn't "messed up" untill now, then perhaps it had affected you.
And, btw, next time, get your friends to order a pizza w/out peperoni. They often hide peperoni under the cheece. Also, check with the water about gelatin in the cheece, and don't eat at Pizza Hut, because they put meat in their sauce.