Thank you for taking into account my points on Bill's health
He is going to have to address it; a full physical and EKG is going to show he needs bypass surgery especially if he is going to try and run a full schedule (he has to lose weight too, something he proved totally unable to do in the white house)
Best bet for him is to come out and admit that like many men his age, he has made one too many trips through the wendy's drive through lane and it's caught up with him, and that following his reelection he will require a bypass surgery followed by a few weeks of rest and a new lifestyle that involves eating healthier, better sleeping habits and a lower pace travel schedule; he needs to phrase it very carefully as I need to slow down for a couple months which I will do during the congressional lame duck period when the president typically doesn't have as much work to do, and that he intends to be on his feet by the inauguration and ready to resume a somewhat lower paced work schedule in January
That said, Bill's worst enemy in this regard is Bill himself... the last 8 weeks of the campaign, particularly since it's close will be absolutely brutal on his heart (since he will have to travel and work a ton) and he could easily keel over at a campaign event somewhere (if he's lucky with angina or a mild heart attack, or if he's unlucky drop dead whilst kissing someone's baby)