is this ITBS

[Deleted User]

After running a half marathon route on sunday past ended up with pain on the outside of my right knee running down my leg, I thought/hoped it was cramp at 9mile but i completed the route although limping quite badly from time to time. The pain come and goes and not with every stride more like in waves. I have rested from sunday but it still causes me to limp when walking but it comes and goes and now i cant localise the pain sort of top of calf around to my shin, can anyone help? i haven't a clue what happened but the race is on the 24th and il be gutted if i cant do the race. is this ITBS? i cant run without it returning (tried a few strides)