Jennie - it's generally knee pain you get with IBT - as a tight IBT can pull your knee over and stop it tracking properly. Theres load of things your hip pain could be - just google " front of hip pain" - you'll see what I mean!
You said in your earlier post today your pain was unbearable - yet you tried to run today? What ever it is is telling you it's injured - I'd not be trying to run. Ibuprofen/ice/rest is the usual course of action.
If you have pain of that sort of level the best advice is to see a physio or GP
