I think this is a common problem. I am getting old, and like my husband get plenty of kinks! A cervical collar helps, your head is really heavy, and the heat and the support help. The other thing I have noticed is that when I start quilting I often raise my shoulders to help more the fabric etc. and it does nothing but cause lots of pain! I got a table tray thing that tilts my machine forward--Now i have one of the sew easy tables and can't use it, but it forces you to sit back in the chair. Try it, just put something about an inch high at the back of your sewing machine base, the 'table' tilts towards you, and you sit back.
You may also try one of those back shoulder supports they sell in the quilting magazines. I don't know what they are called but it makes you have good posture.
Don't know if any of this would help, but I don't think it would hurt to try.