Stem cells for cauda equina

I have had cauda equina Incomplete L4/L5 since 2017

I have a neurogenic bladder and bowels.

I can sometimes empty my bladder without self catherising.

My behind is numb so are my thighs and both feet.

Can stem cells, exosomes offer any relief as I get severe nerve pain and I would like to have my bladder and bowel control back!