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.)
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.)