Sudden onset of heat and pressure in the rt side/front of neck/back of head/by ear & pain under it. metal taste in mouth, tingling in rt side face.

Trigimenal neuralgia: Your ear nose and throat doctor should check you for trigimenal neuralgia or a facial nerve weakness.

Sudden symptoms: Most often indicate the onset of a neurologic problem such as trigeminal neuralgia. You did not mention loss of motor/sensation function seen in Bell's Palsy or stroke. Would recommend that you be seen by a Neurologist to be evaluated. If not a neurologic problem you will be referred to appropriate practitioner. If symptoms worsen before you see Neurologist, seek ER evaluation.