I have no idea what’s wrong

Y’all I am beyond stressed. I have been sick for over a week. At first I thought it was Covid or the flu, it wasn’t. I got tested for a UTI and that was negative. Because my bodies stress response is pooping I didn’t really think much of it but I haven’t been able to eat anything without almost immediately having to go to the bathroom for about 2 weeks. It started with appetite loss, a headache and fever, weakness. Got put on antibiotics THAT I WAS ALLERGIC TO (despite mentioning a previous reaction to penicillin drugs in the past they put me on a penicillin related drug) so I have been taking Benadryl and prednisone to combat the reaction. I feel like I am getting kicked while I’m down, my stomach has had enough. And mentally I’ve been so bad. I’ve reached such a bad low that I canceled driving to my boyfriends house because I struggled to focus on the road on my way home from work. I don’t have health insurance, Im low income and moving somewhere new this month. I can’t afford to get all these tests, but my body is so tired and Im scared. I want to feel normal again