Thanks for posting your query.
Are you suffering from diabetes?
is common with diabetic status.
You should consult with internal medicine specialist and should go for thorough check up.
In my personal opinion, you shouldn't take such high doses of pain killers.
This is partially improve your condition but may put you at high risk of kidney damage and gastritis
You should also go for blood sugar fasting & postprandial, glycosylated hemoglobin
, affected shoulder x ray.
is the most effective way for getting relief of this situation.
You should also contact with dermatologist
for skin lesions.
There could also be possibility of scabies.
Dr. Mayank Bhargava