Go to any major computer store and they will give you the dimensions for sitting or standing at a workstation or table. Having the machine at the proper height for you is critical. It is important to remember that you bring your work to your eye not your eye to the work. You have a serious problem. Too difficult to comment on here.
Some people use gloves that seem to help.
I think you should look at the whole picture. When I do it too long. Have tried lowering my sewing table and inlaying the sewing machine. Helps if you can't lower your machine, i've used a phone book to sit on to raise me. I keep slipping off dutch.