First of all, have a safe and speedy recovery, Euan.
Now, take it from someone who at a much later age went through all kinds of surgery (qyadryoke bypass, aortic valve replacement, etc., etc.), DON'T RUSH your recovery until you are in in tip top shape. It's tempting when you start to feel better to jump into everyday activities. I did that and, as a result, I was in the hospital again much the worse for wear. We all love you -- so PLEASE do yourself and all of us a favor by taking it -- dare I say it? -- one step at a time.
BroadwayEd