As someone who just got done running a race with ITBS, this is what you can do beyond the typically rolling/stretch/strengthen to get you through the race:
Go to an ortho. He/she will prescribe stronger anti-inflamatories.
Go to a PT that does Graston. If you can find one who also does laser treatment, that's a bonus.
If you have access to a pool, definitely switch to aqua jogging as much as possible. It will maintain your cardio and strength while keeping the IT band from causing more inflammation.
When you're running on the road: If you start to feel pain, slow down. If the pain continues, stop. Continuing just makes the inflammation worse which is what is causing the pain.
If the all of the above (including the rolling/stretching/strengthening) doesn't work, a cortisone shot will help. You have to pretty much demand it, and mine said she didn't think it would help. She also said it wouldn't hurt though, so she was okay giving it to me. It helped me tremendously (see my post about the 50k), and I'm glad I was persistent with getting it. I had mine done on Thursday morning for a Saturday morning race.