well if its a pinched nerve, your toes are in the L5 S1 region of your back i think a little lower S1 to S2 back of your back…
I really don’t know if a pinched nerve in your back can realyl happen… i know when i blew my back comepletely out… i had three disks pushing straight into my spinal cord, so i obviously had a pinched nerve at that point… your nerve pinch could be somewhere enroute from the toes to like the s1 region.
see nerve pinch