Flight home symptoms and conditions

Well I'm glad I'm not alone...I was given the generic brand for Bactrim for a Staph infection and I took the first pill this morning. Just before lunch I began to feel quite dizzy and even after eating, I still felt dizzy and out of sorts. I came home and went straight to bed. Has anyone experience dizziness w/ Bactrim or its relative generics? I also have diabetes and my levels were a lot lower than what I'm used to. Needless to say, I called my Dr and they are giving me something else.