Hi @importantcargo, I had not heard of it either but did find a couple of articles that seems to be describing what may be happening for you.

"Over-the-counter drugs such as acetaminophen and NSAIDs can cause MOH. Overuse of triptans and opioid pain relievers like codeine can also ..."
-- Refractory Chronic Migraine: When Regular Treatments Don’t Work: https://www.healthline.com/health/migraine/refractory-chronic-migraine

"Medication overuse headache (MOH) can also be misdiagnosed as migraine. Many people with migraine who use abortive medications frequently experience headache ..."
-- Migraine Mimics - Practical Neurology: https://practicalneurology.com/articles/2019-may/migraine-mimics

Have you thought about seeking help at a major teaching hospital or health facility?

Sounds like an allergy to those meds, to me. But then I do lots of chemical allergies. I've had moh migraines, but not for years. They lasted from 1990 thru 1995. I did have some months off in there. I used to live on the floor of my bedsit (back then), for most of 3 days at a time. Getting up and stuffing some food in my mouth and wash it down, or carefully walking to the bathroom, and then laying back down. The few days off from the pain were spent getting more food and necessities, refilling my prescriptions, and then enduring whole days (or more) of it, all over again. It is truly horrible stuff. And it would sometimes happen 3 times in a week, 3 days of it, at a time. It was the best description of hell on earh I can think of. Because you can barely think through it. Having it only once a week is still hell. My relief began with Imitrix injections (in those days). What to say? Maybe "this too will pass"? It did pass, for me, eventually. I wish I could promise that to your too, that it will end someday. Oh, I stilll get migraines, but without the pain (just the other symptons and there's Odansetron for my nausea). I guess, if I were you I'd try natural products. Try to figure out if you are having a reaction to some of your meds or environmental chemicals you are exposed to. But really, that's a big order for someone having moh migraines, because just enduring what you can't stop is already a big job mentally. I do think that another suffers advice to me to take high B Complex so my nerves would have the raw materials to heal and rebuild themselves did me a lot of good. I can't think of another thing to say. So, I'll pray for ya. So sorry you have to go through this. Really.