you can request wheelchair assistance for air travel. They will help you a lot without needing first class. Even things like going through customs and security are assisted. If you ever need it just ask when checking in. I'm speaking from personal experience, not as an expert.
I had 2 travel insurance companies and both were garbage. One i tried 2 days trying to figure out how to make a claim. I suggest learning how to claim before you travel, now. You don't want to be trying to figure it out in emergency room. Not paying claims is how they make a lot of their money. Imo