Workout tips/motivation?

Ok ladies... I'm really trying to get in shape. I have a Mexico vacation in 6 weeks and have 20lbs left to lose!! I've lost almost 60lbs the last year! The problem is I've hit some stuff that destroyed my motivation... 1. My wrist is injured and I can't do half my work out now. 2. I currently have a kidney infection. I am on antibiotics but it's making it hard for me to want to do anything. 3. My family is one the opposite of a diet and I'm the o my one trying to get healthy. I live with 7 other people who constantly buy candy and soda and ice cream and take out and pizza... it's so extremely hard to be motivated enough to say no. Any ideas or advice?