Any ideas please help?!

So my fiancé has been have bad middle/upper stomach pain (belly button to ribs) since last Friday. He went to 3 doctors got a bunch of tests and no one was able to diagnose him. His only symptom is stomach pain and it comes and goes throughout the day. He said it hurts when pressure is applied. Moving around makes it worse and laying down is the best. He puked once when the pain was really bad and it was just clear liquid. He hasn’t had a fever, just normal temp. I know no one can really diagnose him, but has anyone heard of anything similar, it’s been almost a week?