There is always another race. Don't hurt yourself doing it if you are not sure.
Get it treated properly so you can compete without worry. Most of the people on here including me have had to blown out races due to injury. There is nothing more attractive than a woman (or worse a man) finishing a race hobbling and whining with snot all down their face that the St Johns then have to deal with just as they cross the line.
Or the casualties that are lined up flat on their backs on the nearest grass verge having Lucosade Sport tipped into their mouths, covered in silver blankets just beacause they havn't trained enough and started way too quickly or they hope the crippling injury will magically heal the night before.
It's great that you want to do it. And if it isn't this time due to the injury it really doesn't matter.
Can I just add a an absolutely forbidden practice. DO NOT GO ON YOUR MOBILE!
During the Bristol Half a few years ago, at the start the traffic is pretty heavy until it thins out a bit. There was about 4 people lined up in a narrow stretch behind this berk shouting down his phone "YES, I'M ACTUALLY DOING THE RACE NOW! I'M ON HOTWELLS ROAD! CAN YOU SEE ME YET?"
Until someone thankfully snatched the phone off him, shouted "He'll call you back when he's stopped pissing people off".
And very accuratly threw it into a wheelie bin.