What can be causes of constant nausea?

Hello, ever since Christmas, after eating a can of peas, my boyfriend has been experiencing nausea everyday! He has only ever vomited twice. The only relief he seems to get is sleep, before it all comes back again. 

In February, he got an endoscopy, blood test, and his esophagus was checked, all normal!! He is getting a colonoscopy soon since he has digestive problems since he was 17. But I'm afraid his results are gonna be normal and he's gonna be put back into the loop of not knowing what's wrong with his body.  

His only real symptom is nausea.. everyday. People have told me gallbladder problems, but he doesn't get the other symptoms??  I'm sad for him, he can't do much with his condition. He got acid reflux medication and it didn't help at all, he said.  

I have been researching everything I can find, I am worried sick. Please if anyone has any ideas on what he might have, tests he should get done, similar experiences, pleaseeee let me know. He is only 20.. He shouldn't have to deal with this horrible pain so much. Thank you.

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