There could be several causes of the symptoms you are having including a muscle pull, injury or trauma at the site, chest infection, gall stones
You should apply some local pain
relief medications, take some oral pain
relief medications, maintain a proper posture throughout the day, try some warm compresses.
You could take some antireflux antinausea medications and see if they help with your symptoms - this could be pain due to reflux or GERD.