What Is Causing The Swelling Between Clavicle And Sternocleidomastoid Muscle With Pain?

I had cervical fusion in 1998 of c 5/6 and c6/7 with titanium plating. It was preformed as an outpatient surgery. Something went wrong and I now have 4 paralyzed cranial nerves. 9, 10 , 11 and 12 are unilaterally paralyzed. The right side of those Cranial nerves are paralyzed. I suffer off and on with a painful, hard to move, clavicle/shoulder. It swells greatly between the space above the clavicle and the insertion point of my strernocledomastoid muscle, The swelling is very visual and does cause pain to neck movement and some shoulder movement. is this probably due to the nerve paralyzed or the fusion? nothing helps. Thought might try motrin. The swelling last 5 days for a week or so then comes back a few months later.