Hi,
I'm so sorry that you are going through this awful situation and for more than 2 years! Have you considered looking up the side effects of the many medications you are taking for this? Often the side effects of a medication can make things worse.
I wish you the best and will say a prayer for you.
PML

After two plus years of GI issues (nausea, vomiting, weight loss of 40 # in 4 months), I was diagnosed with CVS.

All of the recommended meds I am on for Fibromyalgia - Amitriptyline, Baclofen, Imitrex, Omeprazole, Pregabalin, and Sucralfate - and wondering if there are more options. Diet, lifestyle, and exercise of course. Is there something I am missing?

I know everyone is different, but there has to be a working solution for most.

Did they rule out abdominal migraines as that causes very similar features. My nephew had it when he was younger and he didn't think he had migraine symptoms because they were so subtle. It's more common in children but it effects adults as well. Try using google scholar after you search for some medical topic to find peer reviewed medical papers. Here's a title of one of them and you could search just using the title (I'd link it but not sure of the rules here). "Guidelines on management of cyclic vomiting syndrome in adults by the American Neurogastroenterology and Motility Society and the Cyclic Vomiting Syndrome Association". Did you even know there an association just for that? I didn't.
This is fairly technical but most people can gain information from them. My daughter has had CVS too but we're pretty sure hers was caused by pot.