I think i have damaged my sciatic nerve, i don't know how but i have random tingling and numbness in my feet, legs, arms and hands. why could this be?

See your doctor: The sciatic nerve is actually a bundle of nerves that starts in the low back and supplies the lower extremities only. Numbness and tingling of both feet, arms, and hands is not consistent with a sciatic condition. See your family doctor or internist to find the cause of your symptoms.

See below: Damage to your sciatic nerve would not dause arm or hand problems.