Thanks, it’s not debilitating so much these days. After extensive investigation via the NHS (not much help…) and things like self-funded tests it seems most closely linked to stress. The exact same foods, meals even, could produce different results on different days so things like elimination tests proved fruitless.
However stress management appears to have significantly improved it to the point it’s quite irregular and relatively minor when it appears.
Coffee however, especially on an empty stomach is still avoided!