Glad this trip worked out.
For future travel, consider off-loading this task to another relative or close friend. As you pointed out, you have more than enough on your plate and need to focus on that. If you get someone else to spend their time on the travel task, that is one less thing for you to do.
One thing to skip is the cancellation for "medically necessary travel". That is the exact opposite of your situation. You do want to travel. It is simply that you may find a better way to travel which is less financially burdensome. The UA fee waiver is designed for the person who purchases a ticket and then gets sick and cannot travel. Even then, it is not a sure thing and the last thing you need to do is to chase all of that.