So tired today

Today Lexi had her school program and Christmas dinner. The food was ok and the program was cute. They sang a couple songs. Lexi was the reindeer Cupid. While I was at the program daycare called and Nathan was running a fever and puking so I had my mom pick him up and meet me at home and watch him till I could get there. Poor baby feels bad. He laid around most of the afternoon and he ran fever all day even after i gave him some motrin. Lexi is also getting sick, she has been coughing pretty good all day. Jake is still running a fever also it stayed between 99.4 and 99.7 today. This is week 5 of fever and I want answers, but of course I get none. I just dont understand how a newborn baby can have so many problems already.
I am so tired lately I really dont know how I am functioning. I hardley get any sleep. Jake is up every 2 hours and stays up for an hour at a time. I try and rest during the day when he sleeps, but I have things I have to get done, so most of the time it's impossible. Then the kids get home from school and then I get real busy with homework and dinner and bath and bed time. It's all just wearing me out. I can't wait till Jake starts sleeping all night.