Had cauda equina, did surgery 4 months before, bladder function has not come back, urodynamics showed nerve problem, will it come back.i am only 24 yrs?

There is a chance: There is a good chance the nerves will regenerate but it will take time. I'm sure your surgeon can give u better odds. Treat your depression if ur getting it, it's frequent in these situations. Physical therapy may help, don't give up hope. I assume u are self cathing. Don't wait too long and let ur bladder stretch. That can be a seperate problem. Good luck, there is technology that may help.