What do I take if I am allergic to both amoxil (amoxicillin) and sulfa?

Depends on infection. It really depends on what type of infection you need to treat. It is likely safe to treat with a 3rd generation cephalosporin (cefdinir), or another class of antibiotic altogether. Other types include antibiotics such as biaxin and cipro (ciprofloxacin). Again, it depends on the infection you need to treat.