Symptoms: Constipation, Diarrhea, Bloating, Intense stomach pain, Release of Bile every time my stomach starts to hurt or I try to go poop.

I’ve been having these problems since last Friday and it seems to be getting worse. It went from being constipated, to having diarrhea, to liquid yellow and orange bile releasing every time I feel I have to “poop” or have pain in my stomach. I went to the doctors and they said it might be “food poisoning” so they gave me an antibiotic. I have not been throwing up or had a fever. Every time eat or drink water my stomach immediately hurts and I have the feeling to go poop but end up just releasing yellow or orange bile. I’ve been trying to follow the BRAT diet but I’m afraid to eat now. Please Doctor what do you think is wrong with me and what can I do to fix this? Thank you.