My short answer: The more I exercise and move my arm the less it hurts.
I will list some of the things that work for me.
1.
Easy exercise and stretching at home: I have a few tools like a foam roller
http://www.amazon.com/White-Foam-Roller ... 910&sr=1-6, one of those big exercise balls, yoga blocks and a yoga strap. I mostly do light exercise or yoga about 3 times a week or more to videos at home that I either borrow from the library or find on the internet via YouTube or Podcasts.
2.
Group exercise: I find that I can only handle going about once per week, and I only go to locations that allow me to pay per class or buy just a few classes at a time. Memberships are too much commitment. I do like group classes because I push myself further than I do at home. If the instructor doesn't know me I talk to them before class so that I am not focused on or pointed out in class. I prefer to talk about ways to improve with the instructor after class.
3.
Massage. You said it yourself, it's expensive. I recently started getting bodywork done and it has been so immensely beneficial that I really feel it is worth it for myself to feel better. I have tried other healing modalities like acupuncture and Reiki. I find those methods helpful, but since I have to pick one I choose to spend my money on massage because it is direct and shows an immediate positive effect. It helps get my muscles and blood moving in ways that I cannot do on my own.
Other things I find help:
• tiger balm
• when it is feeling extra painful and I do not want to exercise or move I alternate a heating pad and ice pack
• lay on the floor and place a tennis ball under your back in the area that is painful (edge of scapula) this is similar to what the foam roller does
• I take pain medicine as a last resort, and I also have bouts of insomnia. If I am having an especially troubling night I will take a sleep aid.
All the things I mentioned require time, effort and in most cases some money. I have become frustrated and given up a few times, but I find when I do those main three things that they help me manage my pain the best. You just have to find the right weekly routine that works for you. I hope this helps, and feel free to send me a private message if you want to chat.