Vagus nerve causing constant nausea?

44yr old male. I’m dealing with my second bout of 24/7 nausea. To clarify, it’s severe nausea and diarrhea…no vomiting. First lasted 10 days (5/7 - 5/16) and this second one is on Day 5 (6/6 - present). Between the two bouts I’ve made 4 trips to the ER. They just give me fluids, say all my bloodwork is normal and send me home. I was prescribed Flagyl during one of those trips and had a severe reaction to it where it made me have shingle-type pain and depression. Was referred to a Gastroenterologist and had a colonoscopy and EGD. Everything looked ok except for a little Gastritis, Esophagitis and Diverticulosis on May 17, 2023. All the doctors I’ve seen here in the northwest corner of Alabama tell me I’ll be fine and send me home. My Gastro doc says he’ll refer me to wherever I think I need to go because he says it’s not making sense to him either. My mom sees a Neurologist at UAB Medical in B’ham, AL due to having Myasthenia Gravis. I’m looking at trying to get a referral to him. Why? I think maybe there is the possibility of having damage to my vagus nerve…or something pressing on the vagus nerve. Do you think this is a possibility or can you offer a better suggestion of what is going on with me? I’m at a loss and I can’t go to work and enjoy time with my family. *Side note: At night I can sedate myself with phenergan and zzzquil and sleep most of the night (6 hours) not nauseated, however, I wake up extremely nauseated and “fuzzy” headed. I also can’t lay down during the day because the nausea is too great. Sitting up is bad but not as bad as lying down and standing up is bad but not as bad as sitting straight up. Only meds I take daily are Valsartan 320mg, Tadalifil 5mg and Nexium. Please help me figure this out. I know there are people out there with far greater issues and I pray for them and hope they get answers too, but if anyone has an answer to my issue…I’m listening. Thank you very much!