Yes, my daughter has this! She had Ehlers-Danlos Syndrome. We never knew why, since she was a baby, she would throw up so easily and often. She had so many tests done, and finally this spring we discovered what has caused her multiple illnesses! One common problem with her condition is delayed gastric emptying (gastroparesis). We tried a few medicines from the gastroenterologist, and found the best thing for her is a tiny amount (1/4 of a 250mg pill) of erythromycin before meals, which helps empty her stomach.
The underlying issue is that her connective tissue isn't formed right. Therefore, her skin stretches, she has joint pain and hypermobility, headaches, walks a bit funny due to ankle issues, has pretty strong nearsightedness, scars easily, bleeds easily, and her GI tract is likely affected. She going in for an echocardiogram and genetic testing next month at Johns Hopkins (took months to get in, but luckily we live nearby so it's convenient).
I wish you luck with your stomach issues! I'd ask you doctor about erythromycin if you're not allergic. It took a week or so before it started helping, but now she won't eat a meal without it!