Hiya A,
It sounds to me like a Yeast allergy/sensitivity which can't easily be blood tested without false positives and false negatives etc.
(whereas a hernia is physiological)
So can you carry out an experiment called an "Elimination & Challenge' test?
Do this by...
Staying away from main offenders like wine, beer, bread (except yeast-free) and thus burgers/rolls, cheese, smallgoods meats, mushrooms, sweets and heavily sugared products for a couple of weeks until a Fri night?
Then get stuck into the above over 2 days and see if you feel worse?
RSVP, because there's a 'dark field microscope test' available in Macquarie St city or out in Penrith where this problem can be detected. It's a common complaint, but not so easy to diagnose in contemporary medicine.