Help please

Hey everyone we adopted a 2yo Siamese cat via a rescue in upstate NY. Since day 1 of having her, her poops have been like a loose pudding texture and not a real shape to them and she would stain things like sheets and whatnot after pooping so we kept her solely in the living room/ kitchen with a cover on our couches. Her stool samples came back once with a parasite and we took care of it and it came back clean afterwards, but yet her poop never got better. We took her to a different vet and they prescribed her Metronidazole - 50 mg/Tablet twice a day for 10 days. By day 8 I saw a bit of a shape forming but still loose but it had blood in it. They said it was normal for a little bit of blood to be in the stool but then it took a turn for the worst. Her poop was like liquid, she would stand up and it would literally just pour out of her. It stinks SO bad. Her poor butt is raw and she’s been loosing hair like crazy, won’t eat and when I try to rinse her but she meows so loud. She barely ever meows she’s super duper quiet.

Has this ever happened to anyone? We haven’t gone back to the vet to try and wait it out hoping it will resolve itself which the vet said it was okay to do for now - but I’m at a loss here, I feel so bad for her cause I know she has to be in pain. I had to unplug her feeder yesterday cause the food just kept piling up. She doesn’t really purr anymore when we pet her either and just stays inside her box when we come home.

She has a little triangle bed/scratcher, a bed and the other day for shits and giggles I put a box next to her bed and she’s been in it ever since and I don’t want to take it away from her.