Sounds like perimenopause. Irregular menstrual cycles, and "doctors are clueless", are both symptoms of perimenopause; and trigeminal neuralgia is associated with menopause (see e.g. https://pmc.ncbi.nlm.nih.gov/articles/PMC3401754/#sec2-4 https://pmc.ncbi.nlm.nih.gov/articles/PMC4247552/#sec2-8).
I'd recommend getting your bloods done, and then (if you are experiencing perimenopause) try taking enough œstradiol to get your levels back up: that might reduce the pressure on your trigeminal nerve, if the two things are related. (This of course increases your cancer risk, but for most women it's worth it.)