Hello, greetings from Kolkata. As per your complaints, it seems you might have hurt some soft tissues inside your shoulder. Bench press with heavy weights can cause a superior labral injury or a partial cuff tear. You need to avoid any shoulder related gym activity as well as lifting any weights. Give your shoulder time to heal. Take paracetamol if needed.

This treatment is being suggested on bases of the information provided. However I would like to examine & investigate you  in detail. -Control  Hypertension, Diabetes or  metabolic disorder, if there is any. --. Sleep on a hard bed with soft bedding. --. Keep no  pillow under the head. --. Avoid painful acts & activities. --. Fomentation with warm water. Let the part not be exposed to cold. -- .Do mild exercises for neck and shoulders. --.visit my YouTube channel 'DrN C Gupta' and watch 'Me & My Yoga' and 'Yoga Simplified'. Kindly subscribe to the channel to get continuous guidence & notifications. It is free. -or else contact a physiotherapist. https://youtube.com/channel/UCPEQc6B1ywzwin048JSu6rw -Any way it may be tried, --. Ugesic (Piroxicam) 20mg 1 tab once a day x 5days --. Caldikind plus  (Mankind) 1 tab Once  a day x 10 days. -(You may need help of your local doctor to get these medicines.) Kindly make sure, there is no allergy to any of these medicines. --For emergency treatment visit nearest hospital. --Wish you a quick recovery & good health. Dr N C Gupta MS (ortho.) DMC no.3624 Thanks.