Numbness in left toes & up to just above knee. Hiv/hsv1/hsv2 neg, fasting glucose 73, neck & lower back x-rays ok, neurologist found nothing. Help!

See new doctor(s) Something has to be causing this issue. It sounds like a nerve from the lower leg or spine is being pinched. I would recommend you see a physical medicine doctor and perhaps have a nerve conduction velocity test and electromyogram (ncv and emg). If already done, possibly have a repeat test in case first test was faulty for some reason. Never hurts to get another opinion.
Numbness. Consider MRI ls spine, possibly orthopedic eval for superficial peroneal nerve impingement/compression.