One of those day

We have been sick, well the kids have been sick. It started Thursday morning with Luke throwing up. He handled it pretty well. He was lethargic and just watched shows for 2 days straight. The night of the second day Bella woke up in the middle of the night crying. I went in to check on her and she had thrown up all over her bed. We cleaned her up put her in the guest bed and took it easy on Sat. I am not sure what happened today, I thought it was just going to be an easy going Sunday where we could just recuperated. I am not kidding when I saying Bella has been throwing a tantrum since noon. Its now 7:19pm she is in her bed crying now. Everything is setting her off. She doesn't get to sit by me, she doesn't want that shirt, she doesn't want peanut butter on her sandwich, Daddy took a sip of her drink, I wiped her nose the wrong way, she doesn't want to wash her hair, She doesn't want to take a nap ect. ect. (you get the picture). I have successfully not completely lost it yet. Instead of feeling like I'm about to lose it I just feel like crying. I am at a point where I just don't know what to do with her. Consequences just don't work, loving on her works for about five minutes until I do something wrong again, praying helps. I know she has a strong will and I also know she needs that strong will to be able to deal with the challenges she will face in her life but it is heart breaking to deal with. It kills me to watch her be so sad for such a long period of time. What can I do?