I have gotten bite by a spider about two weeks ago. It went away but then it seemed that i got bit again on the same leg a week later but no bite marks. It was more red and painful. I went to the ER and I was told it could be MRSA or cellulitis or something like that. I have been taking an antibiotic with sulfe (DS) And i was doing fine, now I am pooping brown water, throw up everything I eat, and I have nothing left. Now my boyfriend has it. What virus could it be? And What should I eat with my antibiotics. And how do i make this all stop? I am 20 years old, I weight 220, and I'm 5 feet exact.