after
ingesting food or drinks and keeping a detailed record of all foods, drinks and pulse readings. It will show with a good degree of accuracy any
allergies or sensitivity, including hidden
or delayed sensitivity, which is usually very difficult to attribute to the offending substance.
Gluten and wheat are the major offenders and dairy is next.
Your immunity is low, so it's easier to catch a "bug". Let it run its course, unless it worsens.