NEED HELP

Hey so Im new here and just need some reasurance.

I got diagnosised with IBS about a year ago. Ive been doing really good sticking to the recommed diet, exercising etc. I was in college last week and got a toasted sandwich, asked for brown but got white. didnt notice untill I had about half the sandwich gone. Its been a week now and the diarrhea wont stop!! Ive taken imodium but the diarrhea just keeps coming back. Im starting to get really worried now as I havent eaten much for a week and I started vomiting last night. I just need to know if anyone else has experienced something like this and how long I should be expecting it to last. Also any tips on food to eat would be great I have work in 24 hrs and I cant afford not to go in.

Thanks to anyone who replies to this :)

thanks Ides

ya i was onto south doc but was told just take immodium for a few more days and if im still bad after the long weekend call into my gp for testing for stomach bacteria. Seems all i can get done this weekend is go to a&e and hope to get admitted for deyhdration if i get really bad. the immodium seem to be finally working managed to keep a slice of toast in my stomach last night and two yachault. thanks again for answering was just getting so fustrated and panic when i posted.