Ok my friend is very sick. She has a very weak immune system and she's got some kind of a bite or something on her back. She is experiencing dizziness, slight fever, back swelling, cheek swelling, arm swelling, slight headaches and a very bad stomach ache. Plus because she's in so much pain she doesn't eat very much. She's already been to two different hospitals and all they've done is give her some medication and send her on her way. But the medicine just seems to make everyhing worse not better at all. Any advice on what it could be and how to treat it?