What type of specialist is required when there is documented history of hypothyroidism and Hoshimotos thyroiditis, pernicious anemia, atrophic gastritis and low cortisol levels? Symptoms include worsening brain fog and insomnia on Nature thyroid or any thyroid supplement, nausea, gastric burning, extreme fatigue,constipation, feeling suddenly breathless w palpitations including feeling breathless and palpitations.