I’m sorry you’re suffering. I am 69 years old, a woman and have been diagnosed with Hashimoto’s and Hypothyroidism about 3 or so years ago. My TPO Antibodies were also 600 and later came to find out that I had Long Covid! Neither myself or my doctors knew what was wrong with me, but prescribed the necessary dosing to manage Hypothyroidism, which at the time was 125 mcg of Synthroid and 5 mcg of Cytomel. I immediately felt better and the dosage was eventually cut back to only 75 mcg of Synthroid, as my Long Covid was making my Hypothryodism worse. I have learned through reading and doing my own research that Hashimoto’s is controlled by diet alone and the symptoms you’re having were mine and when I got my diet under control, they went away. I have eliminated eating gluten, dairy, soy and seed oils and the body inflammation and headaches, hives, all gone. I have no taste or smell due to Long Covid, which does make this diet easier, but by no stretch easy! I miss food and the way it tastes. Try eliminating these highly inflammatory foods and it should make a difference and pretty quickly too. All the best!