Erica Hayes, 40, has not felt healthy since November 2020 when she first fell ill with COVID. Hayes is too sick to work, so she has spent much of the last four years sitting on her beige couch, often curled up under an electric blanket. “My blood flow now sucks, so my hands and my feet are freezing. Even if I’m sweating, my toes are cold,” said Hayes, who lives in Western Pennsylvania. She ...