Thanks for posting your query,
It seems that you had a muscle pull at your upper pectoral and collar bone area.
You should give proper rest to the area. Do not lift heavy weights from that side.
Pain killers like ibuprofen
after meals along with antacid
along with muscle relaxant
for 5-7 days will provide some relief.
Take medicines under medical supervision only. Hot fomentation and application of local pain relieving gel will be helpful.
is very beneficial in such cases.
If the problem persists, get yourself examined by an Orthopedician.
I hope this information has been both informative and helpful