I get this a lot lately and have been for quite few years now. I am 90% convinced it's due to TMJ but have now discovered that I also have extremely tense, painful and knotty muscles in my neck around my shoulders and I know for fact when I press on the knots they are trigger points as they produce the same pain in my face/headache. I saw physio couple of days ago who did some acupuncture on my shoulder and offered to do ultrasound if it didn't get better.
I have some exercices to stretch these muscles too so will see how that goes. Otherwise when the pain/ache is bad no amount of paracetamol/diclofenac or whatever else does it