For three weeks now I have had bouts of nausea lasting a few hours. I have not been sick, I have no stomach pains but I do have a bit of gippy tummy. It happens every day but I cannot connect it to my eating pattern. I take a lot of medicine for my diabetes but nothing recent that could be tied up with nausea.
. . . but only your GP (or other health professional who can carry out relevant tests) can really work out the cause of your problem (and hopefully find a solution).