oh! I had that within the first bit of starting Ceftin and Rifampin. I felt horribly light headed, dizzy, like I was going to puke. My stomach hurt, and I couldn't get off the floor for 45 minutes. For me, it wasn't a side effect of Ceftin- just part of a herx. I had problems with being lightheaded (POTS) prior to that. It really freaked me out, because I live alone as well, but it only happened to me once. Could you call your doctor up, and ask him about it? He could tell you if its something you need to be worried about or not.