Emma - that's what I have! Protruding discs (AKA bulging disc) at L4/L5 and L5/S1 with bilateral compression of nerve roots at L5/S1 worse on the left side. I also have an unstable pelvis. Which is why I am doing pilates. It will help stabilise everything and take the pressure off of my back. Losing weight will also help.

I definately reccomend a Personal Trainer if you can afford one. But do make sure they are able to accomodate your injuries and will work in conjunction with anyone else you see (in my case, osteo and physio). My team are great. I often message PT with messages from Osteo. I've only just started to see Physio and so far she has happily provided instructions to trainer about restrictions. PT doesn't want me to hurt more than I already am and is pretty conscious of my injuries. At the moment we are doing a lot of pool stuff. I feel like a retard and miss my vigourous activities (especially boxing) but know I have to take it easy for now.

Good Luck!