my 11 year old son had strep throat started on Friday night. I took him to the hospital and was prescribed omaxacillin. I gave him one dose of the antibiotic on Monday. He had a bad reaction from the antibiotic causing severe vomiting and diarrhea. I took him back to the hospital on Monday - he only took one dose and caused the side effects. The doctor gave him another antibiotic to take. He still has an upset stomach and has not eaten. He says his throat feels better. I am afraid to give him the other antibiotic because he feels so sick. He still has diarrhea. Should I take a chance with this other or let him recover from the other antibiotic?