1. Lock the door
2. Lock the door
3. Fever is indicative of infection, that's why you don't spike twice with the same needle. Go to Doctor, no need to say you're injecting gear. Just say you had a small pimple where you shot or something. Deal with it now, while oral antibiotics are good enough. Maybe you'll get lucky and it's not infected, but fever=Dr.
4. LOCK THE F***ING DOOR!!!!