Josephine wrote:thanks everyone!
I was diagnosed with facet syndrome and am getting it treated now. hopefully it will be a quick recovery. glad it's not the herniated disk i feared it might have been. once i'm able to move freely i do hereby solemnly swear i will never skimp on an ab or back workout again so long as i shall live
Glad to know that you got a diagnosis and treatment.
While I agree that muscle imbalance is bad, and strengthening your core is good, the dirty little secret that P90X (or Crossfit, or Pilates, etc.) won't tell you is that a LOT of their ab workouts are actually bad for you if you have any sort of lower back pain issues. Those sitting frog crunches, in-and-outs, "boats", and what not, when you are balancing on your pelvic bones and doing stuff? Bad-bad-bad, if you have lumbar spine issues. Lying flat on your back and doing various leg raises? bad-bad-bad, unless you have some kind of (correctly sized) support under your lower back.
I used to teach Pilates. I have background in dance and gymnastics. Nobody ever called my core weak. And then I ruptured a disk in a bouldering fall. Had PT, rehabbed it, mostly not an issue at all... except now traditional Pilates aggravates my back like crazy. Interestingly, I occasionally had people in classes who complained that their back was hurting after doing Pilates, and they usually didn't come back after a few classes. I always put it down as people having weak core, and not doing the exercises correctly (hard to watch everyone all the time, even when you show the proper form), but after the accident, I started wondering. I am not saying that ALL Pilates exercises are bad for you, just that some of them are not really meant for people with lower back issues and/or need to be done with modifications.
Search for "Yoga for back pain" books by Loren Fishman. She has couple different ones. My PT had recommended those to me, and I found yoga and stretching to be very helpful.
And also, I actually find that my back feels better when i climb regularly. Something about reaching and hanging, I guess... falling-- not so much.

Anyway, my rambling aside, I am assuming that you have PT as part of your treatment. And I would imagine that they have given you stretches and exercises to do. Do them religiously. And ask your PT about other "core-strengthening" exercises you are planning to do, once you are feeling better, instead of just getting back into P90X ab exercises which might have caused your problem in the first place.