Hi, welcome to HCM.
First of stop using heating pad
it will increase pain by increasing inflammation. Instead use a cold compression. It will decrease pain.
You have suffered a superficial injury
. No need to special care. You can take on the counter analgesics for pain relief. Take rest for 1 days. Pain will subside and also bruise
will be smooth.
If having persistent breathlessness then need to consult orthopaedician to rule out rib fracture
Hope I have answered your query.