Dear Rider Jen
It is quite difficult to really say whats going on without seeing you in person. It may be you are having two different conditions happening at once...or it may just be one condition. If we focus on a hypothesis that it is one condition, then its likely that the trouble is from the neck... (only speculating now), my hypothesis is you are having two conditions happening at once now...
I am presuming this because you have said the pain below your elbow does not affect your ability to use your arm...
Does your below elbow pain occur at the same time with the shoulder pain...? does any neck movement bring about any of the pains you've described?
It is quite rare to have bilateralrotator cuff tears...although i have noticed that a lot of people who get surgical decompression done, soon often require another surgery on the other shoulder...maybe because the same arthritic changes are responsible or perhaps they now use the other arm more making it susceptible to injury...really true shoulder problems rarely(if at all) radiate past the mid arm...if you are getting pain below the elbow, really you would need another look at your neck/spine...
What are the exercises you are doing? you describe them as gentle but what are they...?
Do you get any pain when you move your arm...or does this pain remain in intensity irrespective of any arm movement
perhaps injections to the subacromial area will help clarify what is happening...if you are still getting pain after such a treatment then the more likely problem is the neck however if the shoulder pain reduces but the below elbow pain remains then you have two conditions happening at once,if all the symptoms reduce then its probably a rare presentation of a shoulder problem,
Sometimes this is the only way to help make a certain diagnosis...If i took anMRI of my muscle after doing strenous exercises, it possibly will show up as multiple tears as well...what i mean is that MRI's are pretty accurate but they do not identify pain generators just pathology...you may have had these tears all along...besides an osteophyte encroachment would have likely been picked up by this anyway...
This sounds like going around the net really...
i dont know how thorough your neck exam was, but a good neck exam goes beyond simply looking up/down, side/side...
My suggestion is to consider injection therapy, that would help bring things into better light, offer you some temporary relief, and perhaps help with your physiotherapy...do you like needles? have you been icing that shoulder?