Steve, take a break, go and do some of that respite touring you have talked about and no one will think any the less of you.
You are a true hero!
Then after a year or so, think carefully about whether you want another crack at it, reorganise support and sponsorship, with lots more support and a professional pr machine then get into training if you want to have another crack at it, but if you decide to just continue Audaxing, that's fine, you don't owe anybody anything and have inspired many to go further than they ever thought possible, including Kurt, or get back on their bike.
But please don't jeopardise your own health any further for the sake of this attempt.