Ugh, I'm sorry that sounds terrible!
There are some thoughts that CVS may be related to migraines (especially abdominal migraines, which I have had before). I had daily migraines for several years, but treating my sleep apnea bought them down to 1 a month or so. I'm 4 weeks post op with the sleeve and I've already had 3 migraines.
Have you considered the bypass instead? It's reversible and the sleeve isn't. Usually I wouldn't suggest picking a procedure based on its reversibility, but if the sleeve doesn't go well you might be vomiting forever and that sounds terrible.