Suggest Treatment For Tingling Sensation On Forehead

I have mettallic feeling in my teeth for last 16 months & also tingling /crawling feeling in my forehead. I have consulted Doctors Neurologist Psychtrists Naturopaths & dentist with no help. I have low energy all the time.I do Yoga Breathing Exercises but nothing is helping. I am miserable all the time & can't function normally. Please Help.