So confused (tw used)

I've gotten so much better. Started taking my lexapro, the idea of vomit has not even crossed my mind in about 2 months now? I went from not eating to eating again. And feeling actually hungry. I have been working with an exposure therapist and have just had such an improvement. But tonight I ate dinner around 9 hours ago. Then about 3 hours ago I made a ramen. I fell asleep and woke up up in a panic and felt really gaggy ish. It scared me and I had a weird loose/diarrhea stool. I just feel really scared that I'm going to throw up even though I know it's not likely. My mind is thinking I've caught a stomach bug from someone but there's no way since no one in my family has been exposed. I just want to go to sleep 🥲