Has your doctor considered TMJ? Most patients with TMJ complain that their first symptom was chronic ear ache. Ear pain associated with the swelling of proximal tissue is a symptom of temporomandibular joint disorder. That is how my TMJ was discovered because I complained about the deep, chronic pain in my ear.
Perhaps this is an option that you can discuss with your doctor. Here is some information about TMJ.
I wish you the very best
Peace and Blessings