I had diahrrea this morning and have had it a couple of times since a bereavement I had. It can be a result of anxiety because your stomach muscles are tesne. I too can't eat at the moment - I am only eating little bits but usually very little and I have dropped to being underweight. It is frightening and I hate it!
Just drink lots of water, drink nutrient drinks called build-up or complan, they are good if you can't eat much. Try to build up gradually.

Certain foods can make you have loose bowel movements, dairy is sometimes a cause, as it has lactose in that some people cannot process efficientely. I used to get it all the time, but I cut out the milk and only drink soya milk and that has made me better. Sometimes it may be more complex, the best thing to do is see your doctor.

Maggie