Welcome to health care magic.
1.There is nothing funny in these, number of patients come with the same complaints, trauma accidental hit,fall and so on. So don't worry.
2.Yes you need to see your GP, as it needs to examine and take needful action.
3.An
ultrasound scan will be very helpful to see the status - presence of any internal bleed, good blood supply or not, any fluid collection and so on.
4.In case of simple inflammatory changes treatment will be antibiotic course.
5.Any other findings - treatment depends on what they find. AND AGAIN IAM SAYING GET
MEDICAL HELP - IT CAN BE AN EMERGENCY IN MANY CASES. Good luck.
Hope i have answered your query.
Any thing to ask do not hesitate. Thank you.