I hope they find out what's going on with you soon. Your story sounds something like my husband's (age 56.) He had one bout with diverticulitis about 4 years ago. A couple of years later, he started having projectile vomiting episodes out of the blue. Inbetween he'd feel fine, but about once a month (usually after a day of eating too much, such as after the Super Bowl or Thanksgiving), he'd wake up vomiting. If it came on during the day, he'd talk about getting the "nasty-smelling burps," (!)and it was like his system had just shut down, nothing was digesting. He'd feel so sick and weak for about 24 hours, sometimes vomiting multiple times, and couldn't go into work, which is unheard-of for him. We knew something was up because no one else in the family ever got this "flu." He went to a GI doctor a bunch of times, and finally they figured out the right combination of meds. Now he takes Prevacid twice a day and Pepcid at night (both maximum-strength) and hasn't had another episode in over a year. He hasn't altered his diet as much as the doctor told him to, but somewhat (at least now he eats a little breakfast.) He also does have Barrett's Esophagus and a hiatal hernia, though he keeps forgetting this.
Diagnosed: Fibromyalgia, Meniere's, mild liver damage (why?), keloid scar tissue (from burn) on back, arthritis, lumbar disc damage, IBS, migraine
Meds: Nortriptyline, Clonazepam, Darvocet as needed
multivitamins, l-lysine, probiotics, magnesium, malic acid, calcium + vit. D, vit. C