Can TMJ cause ears hissing/ringing? Ear dull aches and ear itching? Laying down moving jaw forward changes sound. MRI of ear and brain were good.

Yes Take home test! It sounds like you have a TMJ problem. The reason the sound changes when you move you jaw forward is you are moving the condyle down and forward freeing the joint to function normally. When you do this usually the sound goes away. (clicking and popping) A good test is to open an close and listen for clicking and popping.Then bite on a cotton tip applicator (Qtip) open and close-no more noise.