It seems like a muscle sprain
, probably costocondritis. I hope you are not suffering from an acute viral fever
, as this is common in it. It is also possible that it is the prodromal stage of a typical viral fever.
Relax, nothing to bother much. You will be fine soon. Please consider taking over the counter painkillers like Tylenol
thrice daily for next 2 to 3 days. Give yourself adequate bed rest
You should be back to normal soon.
Get well soon.