My feet hurt and I'm tired

It's been a long week. Stressful at work everyday but Wednesday. S stayed home from school yesterday, she said she was sick, but fine by the time I got home. P had to work late yesterday, so it wasn't a big of a deal for her to stay home. R stayed home "sick" today, I think she was just tired. P works late again tonight. My cold is almost gone finally other that my nose is still runny. But I developed a sore belly button. I'm not sure what's causing this pain, and it seems hard? Very weird. I had my blood level checked yesterday and it was still good! I must go rest for a little bit before the kids and I met with P's family for my sister-in-law's birthday dinner.