dcis

I am SO sorry to hear of your diagnosis .... with your travel being 'so close' after your results ... you'd have to rely on the results to dictate the surgery dates, in discussion with your surgeon (if you've decided who to go with at this point in time!)   

All going well, they'll say - FINE - go off & have your holiday ... enjoy yourself, then we'll deal with this issue when you get back!  My only thought would be - WILL you enjoy it, knowing what you'll be coming back to?  You don't want to ruin your holiday as no doubt, as you meet up with family & friends, you may feel compelled to 'tell them' ......

I actually rewarded myself with a 10 day trip to Norfolk Island after I'd finished my 'active treatment' (ie surgery and rads - I didn't need chemo.)  They said I could have the holiday in between the two - but I preferred to have it after it was all done, as a reward to myself!  

Re your travel - do you have travel insurance?  You would need documentation signed by your surgeon/GP, I would imagine, to get it processed?  I am guessing it is all paid for by now .... so you 'should' be able to postpone your travel til after your treatment ....but you'll probably only get the 'one go at it'. 
  
Have you booked it all yourself, or is it a 'package' deal?   If a Package Deal, it may be easier to postpone .... 

See if you can google about postponing a trip due to illness ..... 

GOOD LUCK xx