I have had long covid too and a lot of hair loss. I too have a thyroid problem. After two years my hair is now getting thicker. I am still having high BP from covid and drugs interacting with inhaled antibiotics i take for lifelong lung problem. Covid really has caused havoc for many of us. We must keep strong and we will beat it. Take care and know things will get better. Slowly but surely i am getting there and so will you.