Thanks for all these additional information. Okay I am ready and I am posting my answer here. And I am sorry I couldn't reply earlier as I was away from the computer and just returned.
Coming to the discussion;
You have mentioned about 2 major concerns; one is about severe tremors/parkinson’s and the other major concern is about the severe shoulder pain.
Regarding the tremors/parkinson’s;
Please see that you have no sufficient clinical evidence for parkinson’s condition. You have tremors but there should be more than just tremors to suspect parkinson’s. You have some slowing of the motor activities but that appears to be related to shoulder condition rather than due to parkinson’s. To suspect parkinson’s out of 3 classical features (tremors, rigidity & bradykinesia or slowing) one needs at least 2 classical features to make this diagnosis. You seem to have just one feature – which is tremor - so with this much information I cannot consider you are having parkinson’s.
And brain MRI is not going to help to diagnose parkinson’s. For assisting in the diagnosis of parkinson’s you need a special neurological investigation called as DaTscan brain test, which is a special type of SPECT brain scan, this can help telling whether you have any parkinsonian condition or not. If this test is not already done then please ask your neurologist or parkinson’s specialist to arrange this test.
In the meantime you may try one of the following meds to see whether the severe tremors can be brought under control;
Regarding the severe shoulder pain;
I see that no diagnosis has been made regarding what is causing this severe pain. I am not sure what other investigations were done other than the ones you have mentioned above, if an MRI scan of the shoulder has not been done then you need one which can help in identifying various conditions of the shoulder that causes the pain, so please ask your orthopaedist for an MRI scan of the shoulder.
In the meantime you may try one or more of the following treatment options to control the severe disabling pain you are tortured with;
A) Medication treatment options;
Lidoderm anesthetic pain relieving skin patches
Flector (Diclofenac) anti-inflammatory pain relieving skin patches
Truegevity 024 Pain Relief Towelettes
Capsaicin pain relieving skin cream
Nerve-pain pills that also help with shoulder pain like Gabapentin or Amitriptyline
Specialized injection treatments to the shoulder like PRP (platelet Rich Plasma) injection, or Prolotherapy injections, or Steroid shots etc
Narcotic/opioid pain killers like Oxycontin or Hydrocodone preparations etc.
B) Non-medication treatment options;
ESWT (Extracorporeal Shock Wave Therapy)
Cold Laser therapy
TENS (Transcutaneous Electrical Nerve Stimulation) OR Interferential therapy etc
If you see any of the above treatments you have not yet tried then you may consider trying them to help in relieving the pain as well as the tremors. I am not telling all these above treatments are required in your case, but providing you with a list of several different treatment options that are available for your tremors & pain conditions. In the meanwhile please ask your doctors to arrange for the above mentioned additional investigations that can help in finalizing the precise diagnosis causing your severe tremors and disabling pain.
Please let me know if you have any further questions; and if you feel you have received the answer to your question please rate me so that I can receive credit for the time and effort put by me in answering your question.