ok,,,heres the clues,,,tn thought of illnes of the old,,tn mostly on right side of face,,but spreads to left,,,get worse as time passes,,,tn has fluctuating nature,,,it responds to tegretol,,,,,which changes brain chemistry,,,,,,here are a list of suspects.....blood vessel compression,,viruses,,,blunt trauma,,dentistry,,,,old age,,,,or,,,,,,,ammonia,,,of course our filter systems are less efficient as we age,,,hence why tn get worse with time,,tn fluctuations are due to ammonia level,,and our abillity to process it,,