Thank you everyone so much for your answers and support!! I will try all of these at some stage to try and relieve the pain. The last thing I want to happen is for me to no longer sew because I'm in too much pain.
The tilt idea is a good one, I might start off with a door stop or something and if it makes a difference I'll go ahead and purchase a proper one.
I do lots of stretches and get massages when ever I can. I think my main problem is being so tense while I sew! Quite often I'll catch myself with my shoulders tensed right up towards my neck...can't be good. I've asked my husband to let me know if he catches me doing it so I can relax!!
Thanks again everyone, it's comforting to know I'm not the only one!