Hi,I'm 17, and I've had a muskuletal problem with my right shoulder since I was 15. It's not exactly a frozen shoulder, but I do experience much of the same pain.
It all started when I started feeling a burning sensation in the same exact spot, by where the shoulder blade meets whatever other bone it connects to, while using my right arm/hand in repetive motions, i.e., writing, piano, etc. I have lots of trigger points in my upper back, esp. in my upper trapezius region by my neck. I have gone two rounds with different doc., trying physical therapy, tests for nerve problems (came back negative, all's well), and lidocaine injection in the shoulder, neck and chest areas. All of those relieved the pain somewhat; with the physical therapy I became much stronger, but doing phyical repetivie activites still aggravate the trigger point areas, and I think the lidocaine shots made my muscles worse, though it de-flammed the areas. About 5 months ago, I made a visit to a chiropractor reccommended by a family, and he said that my spine is shifting to the left because my left leg is shorter, and I have a straight neck. They concluded that this could be making some muscles tight, to compensate for the leaning spine, and for holding my head up as it is forward. Well, it did seem as if this made a lot of sense, but I did not go for the treatments because I'm still unsure about the chiropractice process. There isn't really anything wrong with my spine, just the alignment.
So to answer your question, on how hard it is looking for information. I think that the internet is an invaluable place to look for information. I recentley purchased "The Trigger Point Book" and the frozen shoulder one, and it has a lot of good information and detailed pictures about relieving the painful areas. I've found the massage alleviates the pain, and I sleep better at night with it. Some of the doctors were prescribing to me pain medications, to be able to deal with the pain. I will only take them if my shoulder hurt a lot, but I would rather have massages, because they have no side effects. =) I'm not against medicine, I just think that if you can do something else without it, go for it. One should go towards the source of the problem, and fix it, not the cover it.
I still don't exactly know what I have. I think that its a combination of what all the doctors have told me. I have a leaning spine, and forward head, resulting in strained trapezius muscles. I have a sort of hypermobility problem with my joints, common in young women, that would make the muscles work even hard, to keep everything together. I have weak and tense mucles that need to be worked on by massage, stretching, and exercise. Lastly, I have a stress/tension problem. I tend to tense my shoulder/ neck muscles when things don't go the way I want; I'm an introvert person, so I don't release emotions like other people, which is healthy for you, so I should probably start voicing myself, and just accepting things the way they are. Oh one other thing, cutting down on dairy, red meat and corn helps. Drinking lots of water and staying away from caffeine is really good, too.
P.S. I would be nice to have a book with compilations of stories of people who have had muskuletal problems, and what they did to alleive the pain (or even better, get rid of it).