K.C.
I doubt you have a hernia, that is fairly simple to diagnose. You may have some gall stones or ibd or one of those types of gi problems, BUT you won't know if no one ever does an ultrasound. The one for the GB is specialized. Keep going until you are heard.
By the same token, I have a young friend who is 25 and has 4 kids and she has had this problem for years and they have done every test possible and found nothing. For her it is stress related, BUT they did do the tests.
Good luck,
K.