Biofreeze roll-on works really well for the shoulder and neck pain along with extra strength Tylenol 500mg. Its main ingredient is menthol USP. I started using it in the hospital when I thought the hospital bed caused the pain but eventually I saw it was a symptom of NMO and I’ve continued to use it off and on as the pain dictates.
A heating pad also works and I'll sometimes put that on before I go to bed. Taking a hot shower and letting it just kind of massage the shoulder area works for as well and I have a hand massager that helps but that doesn't give as much relief as all the other things so I hardly ever use it. I hope some of these tips can help someone else.