My brother gets sciatica, maybe he has a similar problem? I had back problems for years although I believe that was due to excessive kicking with not enough ab work to balance it out. At least I got the go ahead for squats and deads. Won't be going over 50kg mind...
I got another sample of d-test powerchews in my order, nice little bonus especially as I love them li'l bad boys, I wouldn't ever buy them though, I'd just sit there and chew through 'em like sweets!