I've been nauseous nearly every day of my life since I was 13. I am now 20. There are periods when it isn't too bad, and periods where I have to be on Gravol constantly. I always have Gravol with me and it's rare for more than a couple of days to go by without me taking one. I do not vomit, I believe this is for several reasons:
1. I am emetophobic and will do anything to not vomit - including not eating for days and taking two Gravol at a time. (it's ok as long as I don't exceed 8 pills in 24 hours)
2. I actually have an extremely strong stomach when push comes to shove, I've had food poisoning several times and only vomited from it once.
I've seen gastroenterologists and my mother is a GP. I've been diagnosed with a motility disorder and IBS, which I think are reasonable diagnoses and they seem to be true. I'm on a medication for the motility disorder and I have noticed a difference, just not in the nausea. It just helps with stomach pain after eating. I've treated for the IBS using hot compresses and Ovol, because the main problem I get is cramps and gas.
I've been tested for lactose intolerance, celiac, and a whole bunch of other food issues. I came up negative for everything, although my allergenist tells me I'm definitely lactose intolerant even if the test was negative. I've been tested for thyroid disorders and screened for cancer, ulcers and Crohn's.
I haven't had anything that made the nausea go away, so I thought I'd just throw this out on the internet and see if anyone had any inventive ideas. Um, lots of heads are better than a dozen? :p