22 month old .. sick


Hi we just got from Florida .. and on Thursday my son had a temp and projectile vomited about 3-4 times .. Friday temp final was normal but he was having loose stools and today he has been having diarrhea!! And his bum and areas r so red and it hurts him when I wipe .. I have been changing diapers like crazy .. I thinking he may have a bug and his body is just trying to get rid of .. his appetite has been hit or miss .. been having a lot of fluids and popsicles 😬.. just wondering if I should be more worried ?!? I usual am the worrier but ppl told me not to panic.. just need some advice first time mom !