Sounds just like my eldest! she's 3 and gets everything going. It also lasts twice as long as it would for anyone else - she's had hand foot and mouth 5 times, a stomach bug which lasted 3 days for the rest of us, took 2 weeks for her...nightmare! Littlest one is 14 months, she's been ill 3 times in her life, but when she's ill, she's really ill (needs medical treatment) and it takes weeks to get better. I used to be a really sickly child too, but since having kids I hardly ever get ill....haven't the time!!
Hope you get some sleep tonight, and the little one is feeling better soon.