A hernia is one of those things that some people can have without symptoms, yet others aren't so lucky. I have a very small hernia and a touch of gastritis, and I think it's the latter that causes the nausea. I find DGL helps, especially first thing in the morning. The only thing that really knocked my morning nausea on the head was when I switched to taking my ppi at night. Taking it before breakfast seemed to leave me without protection just when I needed it most - lying down at night.
Have you got the head of your bed raised? You also need to avoid eating for at least 2 hours before you go to bed.
Most people find alcohol, tea, coffee, spicey food, citrus fruits (especially drinks) and tomatoes are triggers. But, everyone is different and you may discover over time that some of those things are OK for you but that something else isn't.
During your endoscopy you should also have been tested for coeliac disease and Helicobacter - make sure you ask about those when you go back for your results.
Depending on the size of your hernia and other findings (amount of inflammation and evidence of reflux), your consultant may or may not recommend surgery.
It probably doesn't seem fair to have this problem when you are young and not overweight and not smoking..... and not drinking heavily (I presume). However, whilst GERD type problems are more common amongst smokers, drinkers and those with less than desirable BMI, it can pop up in other unsuspecting individuals!
Have you tried taking a probiotic - just a thought seeing as things worsened after the viral attack.
Good luck for your follow up appointment - hope your nausea settles down soon.
New stuff: GERD. Interstitial Cystitis
Lifelong stuff: Food allergies, eczema, asthma