Dealing with Work Anxiety When Sick

I really need advice or even just someone that understands what I'm going through. I'm really sick right now. Fever of 100.6 F, exhausted no matter how much I sleep, and I feel like my head is about to explode. I know I need to call into work, but I just can't. I'm terrified of how they're going to respond. Logically I know this is a trauma response. I was punished severely as a kid for being sick, so now I'll push myself when I'm sick because I'm afraid of what will happen if I don't. I'm supposed to go in at 6:00 a.m. tomorrow. Where I work, if you're sick they will exclude you from work for 5 days. This is because we work with food. I've tried telling myself that going in sick is a danger to other people, but even that's not been enough to give me courage. I'm probably going to end up calling in after I make this post, but I know I'm going to have a lot of anxiety because of it.