Creeper had an RI once. Some of the folks here advised us to use only aspen substrate and to raise the temps in her viv to around 90 degrees. We did that and she pulled through after about 2 weeks. We would raise the temp for about an hour 2-3 times per day.
When yours gets well (and I sure hope it does), you can also try the following.
If you don't already have a temperature gauge in the viv, I would recommend getting one. They are only about $4.00. We also got a humidity gauge. We keep her temp around 82 degrees and her humidity around 40%. Since making these changes, Creeper has not had another RI.
Good luck to you!