Hello, I’m sorry to hear that your husband is experiencing pain issues. It sounds like the symptoms may be from trigeminal neuralgia. This is caused by problems in the trigeminal nerve that provides feeling to the face. Pain is often described as “electric” and short. It can worsen so that pain can be longer. The metallic taste is less common but possible. It is somewhat treatable though. Nerve medication can be used to treat this condition. Carbamazepine or gabapentin are often used. Dental problems should also be explored to make sure it’s not a tooth issue. Seeing a dentist and neurologist would be a good next step. Luckily trigeminal neuralgia is treatable and your husband’s condition will most likely improve. Hope I have answered your queries. Let me know if I can assist you further. Take care Regards, Dr. Timothy Wong