Hi, my 23 mth old had a mild fever this afternoon 100.9 which went away with a dose of ibuprofen and he was fine all afternoon, playing, energetic, eating well. Then this evening his fever spiked again and he started shaking. I also noticed his skin looking mottled when I gave him his bath. And he was shaking after bath and felt cold. He settled with cuddles and is asleep now. He s had a runny noise for a few days, and mild cough. Should I worry? (I am)