Oh yuck, I'm so sorry you're feeling bad! I had this too... it was AWFUL. I was super sick when it hit, my entire body ached from head to toe worse than any flu I've ever had. I slept for several days, my throat felt like I had swallowed glass shards or something. You can also get spots in other warm places too, my sis had it at the same time I did (our children got it and gave it to us) and she got spots on her butt that made sitting down tough, but she wasn't as sick as I was with the fever (it was over 104 for me) and body aches. We think it may be because I'm diabetic that it hit me as hard as it did.
Yes, it's highly contagious, yes, as sucky as it is, stay home and plan a trip to the zoo for another day. Even if you do feel well enough to go, there could easily be other children or adults there who have compromised immune systems (like me being diabetic) who could get extremely ill from it.
I'm lucky. I keep excellent control over my diabetes and am generally in good health, but a nasty virus like that had the potential to send me to the hospital. I'm lucky I didn't have to go.
The kids will likely recover from it a lot faster thanyou do, honestly. But I sure hope you feel better soon!