Degenerative disc disease
No, it won't stall your weight loss.
If you don't like the sweet shakes, try the Unjury chicken soup or add unflavored protein powder to broth and stuff. You can also try adding less protein powder to make your shakes. They will have less protein but taste less strong/sweet. Or use half flavored protein powder and half unflavored in shakes.
Please note: I AM NOT A DOCTOR. If you want medical advice, talk to your doctor. Whatever I post, there is probably some surgeon or other health care provider somewhere that disagrees with me. If you want to know what your surgeon thinks, then ask him or her. Check out my blog.