One thing Kratom extract did was temporarily restore the ability of a combination of clonidine, paracetamol with diphenhydramine, and hydroxyzine to allow me to get to sleep on one occasion.
If one can still get bromphenamine (Dimetapp) and/or dexbromphenamine (Drixoral) where they are, it is a somewhat less anticholinergic antihistamine with much of diphenhydramine's sedative effect, just about as good overall as doxylamine and almost as much so a phenyltoloxamine. It is also quite a good potentiator for dihydrocodeine and hydrocodone in particular . . .
Whats your favorite antihistamine out of curiosity