>> nitza rochez: the aftermath, without a doubt. >> cooper: nitza rochez also got covid in march. the infection was gone, but 191 days later, she's still struggling. >> rochez: i was sick with covid. but this post-covid experience has been beyond the worst experience of my life. ( cheering ) >> cooper: nitza loved to run. three years ago, she completed the new york city marathon, and the following year, berlin. at 43, she was training for another race when she got infected. >> there's a slight unsteadiness. >> cooper: now, she tells us, she has trouble walking more than a few blocks down the street. nitza says she's had so many strange and unrelenting symptoms, she started documenting them on her phone. she got tremors in her hands... >> rochez: why is this happening? >> cooper: ...and had problems with her balance. >> rochez: i had headache, dizziness, blurry vision-- double vision, heavy limbs. >> cooper: it's a lot. >> rochez: it's a lot. >> cooper: for months, she experienced memory problems, trouble finding words, and confusion, something many long-haulers grapple with. they c