Good morning, we started at 7 am! He fussed, went to sleep at 10, woke…

Good morning, we started at 7 am! He fussed, went to sleep at 10, woke up at 3 pm Everything is fine, ate (and immediately threw up everything he ate) and temperature 37.8 (started fussing, gave him a breastfeed, seemed like his temperature dropped to 37.3, but still threw up ?) I don't understand what's going on anymore ???