Persistent nausea after 3 months

I’m 3 months out VSG and few weeks ago I was taking antibiotics, which the pharmacist said I didn’t need to take food so I didn’t the whole time, and few days after taking the antibiotics I was getting very nauseous out of no were and I didn’t eat and barely drank water for about 4 days, then tried to take down some simple foods but of course no appetite. They gave me zofran that doesn’t work. I tried antacids, gasx, Pepto-Bismol, and anything for nausea you can think of and still doesn’t work. I eventually had to go to the hospital from dehydration but they did tests and ct scans and found nothing. No one seems to know what’s wrong with me and it’s so uncomfortable because I still barely eat, and I throw up here and there but nothing comes up or I’m constantly gagging. It’s been about 3 weeks now of this.. Anyone experience this before or know what I should do next?
Thanks for reading this.