In sept tingling and numbness in lower back for two weeks which resulted in complete vaginal numbness since october. I've stumped 5 doctors. Ideas?

Large disc abnorma. At t12 l1if you havent gotten one yet get a mriof lumbar spine.
More testing. Ck MRI lumbosacral spine or get screened for diabetes or vitamin deficiency. If all neg. Consider multiple sclerosis.
Cauda equina. I think you are experiencing saddle anesthesia which is a surgical emergency. Needs immediate emergency evaluation.