What Can I Eat?

I’ve been having a lot of stomach issues lately and I’ve made a doctors appt. for next week to see if it’s IBS since a lot of people I’ve asked say that’s what it sounds like I have. Right now I can’t keep any food in. I had a cup of beef broth for my dinner and it made my stomach hurt so bad that I almost went to the emergency room and it caused me to have diarrhea. What are foods that I can eat until my doctors appt? Everything I think won’t upset my stomach ends up making it super painful and keeps me running to the bathroom.