Yes, and I greatly appreciate your suggestions. Obviously I can't get any REAL answers, but I'm not an idiot either. All I wanted when posting this topic were some suggestions and things that other people may have tried and had success with. I really do find it annoying when everyone replies with 'go see a doctor'. No $#!t sherlock, if I thought it was bad enough to go see one I would. (sorry to rant)
My issue is one that ONLY comes up during cyclocross races, for some reason i never seem to have issues when doing cyclocross training rides, but maybe that has to do with the way I'm riding (going as hard as I can for an hour versus doing shorter, harder intervals). Like I said though, up until the 40 minute mark (almost exactly 40 minutes) I am completely fine, usually sitting with the front group in our P-1-2 CX races, but as soon as my back starts to hurt it goes from zero pain to intense constant pain.
I believe it has something to do with my spine not being straight (as in I have a 5 degree curve), and my fit. I reduced the length of the stem on my cross bike mid-season last year and it helped, I was able to go 45-50 minutes (depending on how rough the course was) before having intense pain, but it still happened.
Anyway, I think I know what I need to do to help this: more core exercising (already started this) and more stretching, along with more off-road riding throughout the season to help my body adapt. Thanks again for all the help!