Hello and welcome to a place no one wants to be, but are very glad its here for us.
This may sound strange, but my daughter just had her gallbladder removed, one of the symptoms she had was should blade pain. After talking to the doctor, (I of course was with her, even though shes 26), he explained to her that pain in or around her shoulder blade was caused by her gallbladder problems, she had 11 stones in her gallbladder, so they removed her gallbladder, and she is doing great.
Its just a thought, although 6 years is a long time, and you might have had more symptoms that just the shoulder blade pain, I know she did.
Take care and good luck,
Kathy