Thanks for query on hcm.
Pain is there due to severe musculo skeletal injury
There might be development of haematoma(collection of blood inside).
Ice application is the first step in this type of injury.
Otherwise start nsaid
with serratiopepdise to subside pain and inflammation.
Local application of nsaid gel will be helpful.
You can take intra muscular nsaid injection if pain is severe.
It will subside within 7 to 10 days.
If pain is not improving much than go for x-ray to rule out any bony involving and consult orthopedician for further guidance.