Welcome to HCM.
radiating to neck and up to ear can occur with anybody. It may be related to your spinal cord
changes like spondylosis
or disc prolapse
or a bulge due to faulty position or over working for certain parts of your body.
In HIV disease also one can get bony changes and certain ART drugs also can cause a reduction in Bone mineral density.
Only with the blood investigations and X-rays, if necessary with a CT Scan
or MRI, one can tell what exactly is your problem. Pain killers cannot be a solution for the same. As you are already on treatment for HIV you can approach your physician, he/she will be able to guide you better.
Don't delay or neglect. Consult your physician as early as possible.
Wish you a speedy recovery.