No relief from nausea.

I am hoping to get some info about some stomach problems. Nausea is the worst of it. Also there is IBS,ACID REFLUX, DIVERTICULITIS. Also there is sometimes a swallowing problem, constipation, and loose bowels. Lately. I have also passed out a couple of times. I have had 6 colonoscopies and 5 upper scopes. I have been on many diets which doesn't help. They have checked for parasites found nothing. The nausea never goes away. They have no idea what this could be. I would appreciate any ideas or suggestions. Thank you all. God bless. Later.