Fell down stairs 5 days ago. Left shin is still very sore and there are parts of shin that feel numb. Top of toes and ankle are severely bruised.

Expected. This sounds like what one would expect after smashing the shin with the edge of a stair. Nerves in the local area have been damaged and will repair with time. Gravity pulls the blood down to your feet and causes the bruise. Should get progressively better.