I had the problem as well. I could take IBP before running and be fine. This was definitely not a good fix though. I am lucky and my wife is a massage therapist. So very religiously for about 2 weeks or a bit more, I stretched quite a bit and my wife massaged the bad leg nightly. I ended up getting really bad blisters in a race so I also took a solid week and half off of running. I slowly have started running again and haven't had any problems so far.
Massage or chiropracter are going to do about the same thing except the chiro has a few more gizmo's to use. Chiro may be cheaper if it is covered by insurance though. I would choose whichever you prefer. Also be sure and stretch religiously daily. Be sure and look up specific stretches for the IT band.
Good luck and hope it gets better before your race.