I had bronchitis. I went to Ojos right after Aconcagua and altitude was not a problem, which only added to the frustration. But at least I could lay in a hot pool near Laguna Verde and take pictures:) And it felt like the end of the earth indeed - only me and two carabinieros in that huge area. Did you climb Ojos?
We did climb Ojos. What a let down for you though! I had a similar experience in Switzerland last year. I had just finished acclimatizing on Monte Rosa and I was ready to go to Mont Blanc when I found out I needed immediate surgery for a weird health problem. My partner was able to do Mont Blanc solo while I was in the hospital.