I don’t know how his symptoms really compared to the rest of us as his anxiety level was much higher. My 78 year old father in law had a little trouble breathing the day (Saturday) after his positive test. He was a bit panicked so ordered the infusion. It (and a steroid shot) helped him recover quickly. Tuesday he was outside walking by himself and saying it was due to the Presidential treatment he received.
Smart man. His panick might have saved his life. The earlier you get that infusion the better.