I have peed on myself twice without knowing i have could this happen because of my sciatic nerve pain?

Incontinence: If this incontinence as it sounds in your description - this means that you have lumbar disc issues and this sign is not good. You must haver you spine looked at carefully and you need updated mri.

Cauda Equina: Cauda equine syndrome is an emergency. Unfortunately this requires surgery to correct. Often times the nerves are just bruised abit and the signals aren't being sent quick enough, you may need an epidural steroid injection to relieve this irritation. Either way, i would see a pain/spine specialist to evaluate your options.