Working in a freezer at a distribution center

I work at a big-box store distribution center. I finally managed to get a job here after applying while working for the store itself, and the pay increase has been amazing. I’ve been able to afford a much better apartment than I had before, and I’m starting to save up a sizable chunk of cash. I even get paid more than most workers at the warehouse, because I work in the freezer. I heard that freezer workers get paid more because it’s a little more hazardous. I have to admit that I do struggle with extreme temperature changes. Us employees are fortunate enough that the entire facility is climate-controlled, but because I work in the freezer, I am still walking from sub-zero temperatures into far warmer temperatures back and forth all day long.The company provided me a nice, thick, insulated jacket, but despite this, I often develop a bit of a sniffle or full-blown cold, especially in the winter. I know that I have to save my sick and emergency days for just these occasions, because I’m not even allowed to come into work even if I wanted to when I am visibly sick. My job involves handling food, so I am not allowed to come into work and spread germs. I guess climate control is never more important than in a freezer where perishable goods are being stored, but the extreme temperature fluctuations can often take a toll on my health. I try to take vitamins that boost my immune system, because I want to do everything that I can to keep this job.