This morning I was driving to school and all of a sudden I felt a pain on the left side of my face. It was like on the left side of my chin and on the side of my eye. Not in the middle of my face. About 3 hours after that my fingers on my left hand started to hurt. Like the joints are hurting real bad. I'm thinking this cant be arhritis because I am only 21. I did start a new medication called Zyrtec 2 days ago, but I found no side effects similar to mine for Zyrtec. Does anybody know what this could be?