Try ice/ antiinflamm
Intially, would suggest relative rest (no heavy work or lifting, stop weight lifting, sports using the shoulder), ice for 15-20 minutes nightly the entire shoulder area with flat flexible soft ice pack.
Alternate with heat application, or topical like aspercreme, icy-hot.... If tolerated, may try two advil
) or one to two alleve daily with food. If problem persists more than 10 days, see doc.