I would imagine that your third point wont be anything to worry about. For example if the lab class in the fall at Columbia is not offered in person I don’t think your medical school would find fault in that. And if they did, I’m sorry but that’s out of your control.
Also, I have been reading that having asthma does not lead to a worse outcome. My teen has asthma and I had been very worried about this. I am somewhat relieved when I read studies that found asthmatics with covid dont have higher hospitalizations or mortality rates compared with other Covid patients .
Where is home for you? I am just wondering where you will be flying into if not New York City? Does it make sense to fly home from South America and then fly into New York City?
Where will you go if you live in the dorms and school is interrupted during the year?
By the way I am a Barnard graduate.