HI, thanks for using healthcare magic
After trauma, the pain can escalate after the first few days to it is not unusual that you are now having
severe pain.
If it is possible, since you were punched in the side that you may have injured one or more of your ribs.
If the pain is to the extent that you have
difficulty breathing, then you need to be assessed as soon as possible.
The use of a warm compress to the affected area, 2 to 3 times a day for 15 to 20 mins , may help.
Pain medication such as
ibuprofen,
naproxen, cataflam or
celebrex would be helpful. Should be used consistently for a few days.
A cough suppressant should also be used for a few days to reduce coughing because this would aggravate the injury. This would be over the counter.
If there is no relief or worsening or difficulty breathing, you should be seen.
I hope this helps