I surely do understand what you are going through. It's been awhile because my kids are grown but I remember those very tiring days & nights taking care of sick kids.
On one of my little grandaughter's visits, she was about 9 months at the time, she was sick with a bad cold. She woke up in the middle of the night screaming her head off so we had to give her some meds in a dropper (boy, she didn't like that) and then we had to use the syringe to suck stuff outta her nose (she really didn't like that). It took three of us to do the job all the while she was screaming. WHEW! I'm getting too old for this.
Hang in there and hopefully things will get back to normal very soon and you can have a wonderful, well deserved night's sleep.