how can i releave my excruciating neck, shoulder and arm pain?

I would recommend that you have a cervical MRI to find out what is going on at the disc level in your neck. It is possible that you may have a disc bulge that is causing your neck and shoulder pain. When a nerve root in the neck is irritated or compressed, a patient will show certain signs and symptoms- such as weakness in the upper extremity, absence of reflexes in the upper extremity, and different sensations such as tingling, burning or numbness.  Pain Killers are only a temporary short term solution- they will just mask the pain, and not take care of the problem.

Have you tried cervical traction for your neck? Here is a great article- How to End Neck Pain by Doing a Cervical Traction Program at Home

Another great idea for sleeping comfortably at night is to roll up a towel and put that under your neck. Here is a great video that shows you how to create a towel roll at home for neck pain relief. http://www.youtube.com/watch?v=0ZQoJ2psHIs

For pain relief you can also use ice on your upper back and neck for 10-15 minutes. Ice act as a natural analgesic for pain relief and helps to decrease inflammation.

How to Create a Neck Roll for Neck Pain Relief: http://knol.google.com/k/n-j/how-to-create-a-neck-roll-for-yourself/zl7isboia5fh/2#

If you do well with the neck roll under your c- spine, consider getting a cervical linear traction neck pillow because it will give you traction while you sleep on your side or on your back.