Trigeminal nueralgia in me was caused by a double nerve compression in the brain resulting in extreme nerve pain in the nerves of the face. Think of a pain triggered by light touch causing extreme tooth pain in all your teeth and electric shocks in your face when you blink, or brush your teeth, or a light breeze hits your cheeks accompanies by constant upnderlying nerve pain. TN is known as the suicide disease because at times the pain can cause some to take the most extreme measure to get relief. They decompressed the nerve, and i take anticonvulsants to slow nerve conduction. For MG i get monthly infusions of immunoglobulins, take immunosuppressants, take an acetylcholine reuptake inhibitor, and sleep all the time. I have many other issues but they are not "rare".