Throwing up - think I may have got food poisoning over the weekend and keep bringing up my medication

I think I had food poisoning on Saturday. I am still being sick and having to run to the toilet.  I keep bringing up my medication. I’ve got awful cramps in the tummy.  Last time I ate was about 1pm.  I’m not into food as fed up of dry toast and banana. Just threw up again. It’s making day and night very long