I had a similar job several years ago, with a lot of driving. Great money but crap working conditions. FWIW I started to make my own sandwiches, even if it was just bread and cheese, and switched to caffeine tablets and water because the energy drinks just tasted too sugary after a while. Cheaper too. I stuck with it as long as I could until I found a better job. If it helps, maybe remember that many of the people receiving your deliveries will find great joy from those gifts. I know it sucks but hang with your girlfriend and together you will both make next year a much better one for the two of you.