Avelox and itching skin

I took one Avelox on Friday March 21, 2008 to treat a sinus infection and within 5 minutes my face, back and arms turned beat red. As I looked in the mirror I could see that my lips were very swollen. Within 10 minutes my entire body was beat red and I was extremely itchy especially my head and back. I figured I was having a reaction to the medication so I took a Benadryl which did not seem to work until I took the second dose. I ended up feeling sick the entire day and really achy from head to toe. I had terrible pains in my stomach and every time I stood up I felt as if I were going to fall back down. I was very dizzy and felt just out of it. I was also sneezing nonstop. I went to the doctor and was told that this medication works well for a sinus infection but one of the side effects is an allergic reaction. I have not taken another one since Friday but today is Sunday and I am still a bit red, still itchy (especially my head), still dizzy and still feel out of it.