I'm not sure any MRI will show a pinched nerve. They infer that from your symptoms. MRI's show soft tissue, X-rays show the hard tissue to see if it's osteo arthritis. Disc problems are very hard to verify as being the cause of anything, because all humans show disc deterioration as we age. More often problems are muscular, not due to the disc. But in your case, you are definitely showing nerve problems with the sciatica, but the problem bending over isn't a nerve problem, it's a muscular problem. I know all this because I've got a lot of problems, too, and I've been down this road. You might very well have multiple problems, some of which don't show up on MRIs, such as aggravating your periformis muscles. These are near your buttocks and are part of the hip and the sciatic nerve often goes right over them and if inflamed hits them. I've had it, apparently, because it doesn't show up on any diagnostic imagery. If you showed a significant disc injury, the treatment, I think, would be surgery, whereas injections are usually cortisone and might help but would usually be temporary. It's possible the PT you got wasn't very good, for example, cold laser is a myth, it has no evidence backing it up as doing anything. I can't tell you what you have, but you need to see an orthopedic surgeon who will tell you if you need surgery. If your imaging doesn't show anything significant enough for that, as it apparently didn't they will always send you to PT. Injections are when it can't be fixed. You have to do something quickly, because the way you're walking will really mess you up. Again, can't tell you what's wrong, can only tell you the injections might help you stand up straight for awhile and might give the PT a chance to work, but you'll need to try a different place for it I think. It can take a long time to rehab an injury, and if you stopped doing the PT, it won't work. But it also seldom fixes anything,, it usually just stops you from doing the thing that hurt you and then hopefully your body heals itself in the meantime. It might be you do need surgery, but docs are conservative about it because it doesn't always work. I think the surgery is fusion, which basically takes that disc away and will limit your mobility but get rid of the offending pinch. If it works. If you like your docs, you gotta do what they say. If you don't, find better docs. If money is a problem, in this world, you're screwed. Peace.