Same as you ladies, read about feeling really cold, constipation, low iron, low folate, low stomach acid, leaky gut, hair loss, headaches etc etc and suspected thyroid but TSH reported OK! Then because I’m well post meno and started getting these crashes post vaccine and covid, I began using medichecks and T4 below range in May - now 15 and last T3 3.9, my recent crash was horrendous on sofa for 2 months, it was like my body shut down, freezing feet, awful lows, dizzy standing up, no appetite, nauseous, heart having to work harder and no help from private Endo jerk. Why are we to suffer so much just because TSH in a range?!!! I’m annoyed as iv struggled to make Xmas dinner even with help, then eating it raised my heart rate that I could barely enjoy it. I’m SO terrified of crashing again and the extra fatigue and weakness that follows every crash. I really feel for anyone with this health issue it’s so darn debilitating and upsetting. Low FT3 is no joke. Here’s to our better health 2024 ❤️