I have neck and back pain too, in fact I had neck fusion about a year ago, and I find getting up and moving around is the best advice. I get real sore if I sit at my desk too long too.
I also eliminated some things from my diet that were causing inflammation, like gluten, milk, sugar and alcohol and I don't have as much pain as I used to. I can have the last three in moderation, but found gluten REALLY flames me up. When I got rid of that about six months ago I got rid of about 80% of the pain.
I forgot to mention, I usually end up with a hot pad behind my shoulders if I sew too long, resting on my recliner.