Hi Ladydi22,
Just some thoughts that might help you. From my journey to digestive health I have found that I can not totally rely on Doctors and have had to do a lot of research myself. The Medical profession has just realized in the past few years the importance of digestion on health. They have not yet developed tests to diagnose the cause of every digestive complaint.

This article references a study which showed that 67% of IBS patients have SIBO. Have you been tested for SIBO? Your vomiting could very well result from gluten intolerance, have you been tested for that? There is a blood test for gluten intolerance and you need to be eating gluten for it to be accurate so ask for the test if you haven't had it already.

The FODMAP elimination diet can be done by eliminating one food group at a time for 2-4wks and then reintroducing it to see if you react. It is well worth the effort and the only way to determine if a food product is one of the sources of your digestive problems. From my digestive detective work I found I am sensitive to gluten, lactose, and fructose. I probably have non-celiac gluten sensitivity which makes me sensitive to oats and corn too.
As an example of the detective work you need to do: I recently found sorbitol, and artificial sweetener, in packaged tortillas. Sorbitol can cause digestive gas and may also be found in supplements. I find Magnesium Oxide gives me bad gas too and have found it is used in a lot of vitamins.

So you potentially could have a series of food sensitivities as the source of your problems.

It is depressing to have a digestive condition that isolates you and makes social interactions not so fun anymore. The good news is with some detective work you can help yourself and get to a better place and better health.

Best of luck!