....ooops....sorry. Benadryl just a brand name...is totally different compound outside US/Can....
.....what i refer to is diphenhydramine.....which in Britain (EU?)is available OTC (i think)as a "sleeping aid".....perhaps Nytol or Unisom...or something called Dimedrol (help! UK folks). Old time med that i have found personal success with..... and many others report same. batch describes partly as a blood brain barrier transit issue. could always deal with the drowsiness for the definitively beneficial effect....
....away from home PF surely indicative....but involves too much to be specifically helpful (diet, setting, lodgings, activities, etc all different). gonna have to drill down further...
....been chasing diet alterations my entire CH "career".....never amounted to much but i was able to narrow down to several triggers: aspartame (one of the artificial sweeteners), msg (ubiquitous under various names in most prepared foods), allergens specific to me (tomato), and, of course, alcohol. drastic changes do not narrow it down, would suggest taking out specific groups at a time. read your labels..tis unfortunately shocking how many psychoactive ingredients are in the prepared foods we eat...and some of the supposedly "natural"...