Hi Keithyboy,
20 Miles is good,I have only ever done 20 miles on a bus.I have tiredness and i think fatigue and wake up at night and think about it and of course feel rubbish in the morning but I was always one for worry even when i had my own Business and done much the same.
What has helped me since retiring in 2011 is being able to get away for long trips in my Motorhome into Europe and doing some long stretches of driving seeing different places and of course some sun.
I of course at 71 am bit older and the life expectancy comes into the plan and of course any of us could be run over by a bus and you stand more of a chance than me with all your road running,
But joking apart I think once you talk to your specialists about your options and a way forward it may feel a bit better i know once i decided which way to go i felt a bit happier,but after the operation the doubts come back as to have i made the right decision.
Good luck and if i can help in any way i will.
Regards John.