Shoulder: Labral tear and chronic impingement syndrome!

The following is from my surgical notes:

I recently had a shoulder surgery (2 months ago), in which I had Impingement Syndrome with limited space for the rotator cuff beneath the anterolateral acromial margin and Labral Detachment.   Shoulder Capsule was repaired and two sutures were placed in my shoulder towards the superior apex.  I was told that the decompression was successful.  

I have searched the internet looking for people with similar problems to what I am experiencing but was unsuccessful.  As I began my physical therapy, I experienced pretty intense muscle spasms on the muscle below my shoulder blade.  Im not sure what this muscle is, but was told it was a major muscle relating to the rotator cuff?  As time went on, and physical therapy went on, I have been unable to stop these spasms and reduce the "knot".  My therapist has done pretty much all in his power to stop the spasms (ultrasound, stim, massage) but has been unsuccessful.  My therapist insisted that I return to see my doctor, which i did.  The doctor said the spasms and "knot" were uncommon and I was given Skelaxin, and I believe Mortrin 800.  I have taken the medication as directed without relief.  The situation is very upsetting and somewhat depressing as I am not able to do my physical therapy.  What is even more upsetting is that the doctor spoke to me for 2-3 minutes without any sort of examination.  He placed his hands on my shoulder and said, "it is healing fine and it seems to be solid."  My therapist has informed me that my shoulder is swollen but the doctor did not even feel or speak of the spasm.

I am not educated on the structure of the shoulder and if asked, would say the pain seems to be in my upper back.  I now know it is shoulder related.  The feeling is one of tightness, somewhat pain and uncontrollable spasm.  Any help or advise?  Do I have anything to worry about?