Yoga and stretching for the pain. Massage and lymph drainage may help. Also pinpointing if its muscular or some other sort of pain would help too. The yoga position for the heart chakra where you're reaching backwards on your knees stretching the middle of your chest would probably do wonders...

Wash your pillow / pillow case and see if it continues to happen. It could be dust/mold/chemical in nature and an allergic reaction of some sort. If it were astral hearing id expect it to be the same ear regardless Hail Satan!