I had nerve block on S1 and I believe L4. I have bulging discs that are blocking the nerve. the back seems some better still lets me know it s there but I am having pain, tingling and burning in the left foot which is the side I had blocks on. I had a echo and ABI done on my legs several months ago because of the foot pain but nothing found. Can this be coming from my back or do I have something is going on..
Bulging disc can compress the surrounding nerve root. This can occur even after injection therapy.  Such nerve root compression can produce tingling and pain.  If S1 root is compressed, it will definitely produce symptoms in your foot.