aww sandy I've been there before -- complete with tiny tree and hardly enough money to get a holiday dinner together. Year before last, I was in graduate school and unemployed...I know that bummed out feeling of being happy it is the holidays but sad at the same time because it isn't the big family, tons of treats and snacks and presents and music celebration you had wanted it to be. Perhaps since it is your first Christmas with just the 3 of you - start a new little family tradition. Anything fun and cheap - cutting and hanging paper snowflakes, baking cookies together, whatever you can think of to make it feel special and Christmas-y for your family of 3.
Bladder infections are the worst - I'm so sorry that one hit you especially right at Christmas. I know you're feeling relief now from the antibiotics, but I strongly recommend getting a box of AZO and keeping it in the house for those exact painful middle-of-the-night UTI moments you described. That stuff turns your pee neon orange, but brings relief QUICK.
Wishing you and your family a fun and peaceful holiday.