Thanks for your query.
From your description, it seems that you are having inflammation of tendons and bursa over shoulder joint. Exact diagnosis can be made only after proper examination by an orthopaedician. So I suggest you to consult one.
In the meanwhile, for symptomatic relief:
1. Give enough rest to your arms. Do not raise your arms over your head.
2. Take mild pain killers like acetaminophen
3. Stronger prescription NSAIDS with muscle relaxants may help if simple analgesics do not help.
4. Hot compresses will be useful pain relieving measure. You may apply a local analgesic gel on that area.
I do hope that you have found something helpful and I will be glad to answer any further query.