(look at ways of reducing external stress-avoid stressors, meditate, self-
hypnosis,do EFT, listen to soothing music, walk in the park, take more holidays in quaint places, laugh more, read inspirational books, etc.)
You should get your iron levels checked, you need freeT3, free T4 and reverse T3 testing and an adrenal stress profile.
Conventional doctors won't be much help with what I'm suggesting.