What the heck is wrong with me?

Hey, I have a huge fear of vomit...and seeing vomit or smelling makes me **** myself. Sometimes I will be sitting at home all day and for some random reason think that I think am going to be sick...If it makes sence....And then the more I think about it the more I feel sick. Is this just my mind playing tricks on me? I always check my tempreture and it's always 36.5 but I cant help but worry, worry and worry...Urgh..What issue do I have?...