If it's a sinus cold and my head is pounding..I suck it up. However, if I'm really sick like I was last week with the stomach flu, I had no problem calling the parents for the one day I had to take. For one, I didn't want to pass it off to the daycare kids and families that weren't sick. I couldn't keep anything in me and it would have been impossible to care for anyone. gcj is right ~ we all get sick from time to time and I'm thankful that I've got great daycare families that know it doesn't happen often and so when it does, I must be sick.
You need to take the time to get better for yourself. Don't feel guilty~ sounds like your beyond needing a day off and should take it. Hope you get better soon!