Actually, spinal subluxions have a LOT to do with gastric upsets, and a subluxion around the bra strap and a bit further down is RIGHT where the nerve that feeds the stomach is! so it sounds like that is what is happening to you. Your spine is out of whack, which strains the connective tissues between the ribs, and puts pressure on the nerves that "speak" to the stomach. So you definitely need to get a consultation from a chiropractor and start doing Yoga stretches every day, even if they're just simple hurdler stretches. Be sure to bend your back both forwards and backwards, don't just do forewards. And work very slowly and gently. A castor oil pack on the back would also help.