Bloody Hell - that's a bit tough, @Pip47 - Shingles can be very painful - so I hope they can control that discomfort for you. An elderly aunt who had it, had a Compounding Chemist make up a mix of aspirin that was liquified & mixed into an 'alcohol base' that was gently dabbed onto the rash - and it helped her bigtime! She was 90 at the time.
The colonoscopy is 'relatively easy' (tho the prep leading up to it is rather 'ordinary'!) I had one just 2 weeks ago after a bit of a scare (my results from the Gov one 4 weeks previous had been clear - but I don't always trust these annual tests any more!) - luckily all was good from mine! Just piles & diverticulitis!
All the best with your pathology results - then you'll have a good idea of your plan xxxx