Enjoy yourself on the cruise and don't worry about it until you get back! It will ruin the fun you could have. We are close to the same weight & I had surgery for Cervical cancer in September (no chemo). Knowing I could have died and now being nearly bankrupt have radically changed my view of weight loss/life. Be happy you have a (great) job and are now healthy and just try to eat better (non processed foods) and move a bit more. Take the pressure off of yourself or you'll spend the rest of your life punishing yourself and never really get to enjoy life...you only get one, you know!
Take care!
Susyn aka dachsiemom