Ley/Rob ~
I'm sorry to learn of Rob's difficulties and pray they will abate, soon.
I'm not a doctor but my reseach has led me offer you these definitions for some of the unfamiliar medical terms you're seeing. 'Dense trigeminal numbness' is another way of stating that the patient suffers from Trigeminal Neuralgia. The loss of taste and feeling are associated with the (compromised) 5th trigeminal nerve. Rob's 'absent corneal reflex' is a doctor's way of stating that his blinking reflex is not working. This is usually because the ophthalmic branch of the 5th cranial nerve has been compromised by the AN. The House-Brackmann nerve grading scale was developed by the doctors at the House Ear Clinic in Los Angeles, California, famous among AN patients for their work with acoustic neuroma removal. The scale runs from 1 to 6, with 1 being normal function in all areas and 6 being no function in the measured areas. Carbamazepine is the recommended drug for relief of trigeminal neuralgia, which is Rob's condition.
Again, I'm not a physician and this isn't a 'medical' opinion - but it would seem that Rob's facial tingling is a sign of the facial nerve attempting to re-fire. Slightly annoying, I'm sure but a positive sign for all that.
Jim