I also have TMD, and it can be excruciating pain. I had surgery for my TMD...

but I have menierres also...which can do that.

See 2 specialists: an oral surgeon to dx your jaw and make sure it's in the correct place (even slight mal adjustments (too small for naked eye?) can cause this type of pain) and an ENT (ear,nose throat doctor)

Have you tried heat? Warm home made salt bags if you don't have a heating pad... but they have hot packs/gel packs you can warm in the microwave

Tense neck muscles and jaw muscles can cause ear pain... do you put the TENS electrodes on those trigger points? Check the charts or consult your physical therapist for where to put them (I take my tens and let him put them on me!)