| Your insulin should be fine on a flight, provided you keep it with you at all times. If you're really concerned, you can always invest in a Frio pack or something similar.
But for 5 days, you should be fine. I carried around my insulin for 2 weeks in Florida in my pocket and it was fine.
However, you may wish to get your doctor to write you a covering letter. Most airlines are ok but occasionally you get the odd paranoid security person who decides that 8mm needles are a very dangerous terrorist weapon. Showing them a letter from your doctor that says 'this person needs to carry this stuff with them at all times or you're going to end up in court' is a handy insurance policy. | 
