Hey man, I have spinal bifida too. Born with it because my mother got into a bad car addident while pregnant with me. My childhood wasn't normal. So many surgeries and things a kid shouldn't have to go through.
My back is a lot better, but I still experience stiffness a lot quicker than the average person.
You'll get through this man. If I can, I know you can too. From a person with the same conditions as you, my best advice would be to pray, pray and pray. You can't get through this alone and still make it out in 1 piece without help. You got this, pray.