Managing stress is essential to overall health. It's especially important to people with thyroid dysfunction because stress can cause blood sugar imbalances, food intolerances (especially to gluten), digestive system dysfunction, chronic infections, and inflammation, all of which tell the adrenal glands to keep pumping out stress hormones.
Those stress hormones have a profound effect on the ability of the thyroid to convert T4 to T3 and will cause an increase in rT3 production which creates thyroid hormone resistance making you feel worse and even more hypothyroid.
When the body is under stress, we burn through Vitamin C very quickly. Vitamin C is needed for healthy adrenals and a healthy immune system. Find ways to manage your stress level and when under stress, increase your intake of whole food Real Vitamin C.