Bad case of tonsillitis what should i do?

It will take a while for the antibiotics to work. You need some pain meds for the pain. That will be hard to swallow too. But, you need something. They didn't give you any? Go back and get something for the pain. And buy a bunch of gatorade and maybe some boost because you really don't need solids right now. If it still doesn't get better, they may have to actually come out. But, that is a last resort.