Thanks for writing in,
Seems you are suffering from Foot drop
(Common Peroneal Nerve palsy
). Herniated disc
between L5/S1 along cannot cause foot drop. Did you sustain any injury
around your right knee or any kind of compression on lateral aspect of your knee joint? I would suggest you to go for nerve conduction study
for your foot drop and proceed further. Discuss with your doctor.
The ringing in ear or indentations on top of your head are not related to your foot drop. Get yourself examined from ENT and Neurophysician to diagnose your problem.
Till then passively keep moving your ankle joint. Since your leg and foot are numb, take care that you don't get hurt / wounded. Always use foot wears - adequately padded to avoid skin ulcerations.
Wish you a good health.