I have extreme neck, left shoulder stiffness & pain (extends down left arm & left side of back. Went to sleep with no pain...woke up so stiff with sharp (level 10 pain out of 1-10). Sitting, turning head right to left, up, down, rotating left arm creates sharper pain. Laying down, sitting up, standing up there is pain. I have ponstan 250mg, difene 75mg, & nurofen express 400mg. Any suggestions what I should take?