hi alc, i have suffered from a bad back and trapped nerves for years and have slight scoliosis in the last 2 months the trapped nerves have been really awful and i have been on about 6 different painkillers when i finally got to see the physio 3 weeks ago and she gave me core exercises kind of like pelvic floor exercises where you have to tighten your lower tummy before trying any other movement, a kind of nice one was to lay flat and tighten up then with bent knees lower and raise each leg keeping your tummy tight working on not wobbling when you bring your knee back up, another is to lay on your side feet together and raise your knee up this strengthens your outer hips
as long as you remember to keep your core muscles tense when trying any lower body movement it does ease or stop the pain
it has worked for me hope you find this helpful sweetie i know what pain you are in and good luck loosing your stone x :-)