Replacing Biden with Trump is like putting the fox in charge of the chicken coop. I agree that Biden and Harris' support for Benjamin Netanyahu's genocide in Gaza is shitty behavior. But conservative pundit P.J. O'Rourke has the last word.
Here's a 2020 article about Trump's health which is the most recent summary I can find (not to mention that it is a very superficial summary). https://www.wired.com/story/no-you-dont-need-to-see-president-trumps-medical-records/