My 18 month old son started out with a low fever on Sunday night, 3 days ago. Monday he was pretty out of it, just wanted to lay on me and watch Elmo. (usually he is bouncing off the walls and dragging me around the house). Monday night he hardly slept, he had some nasal congestion which he has had at night for a month (figured it was allergies and it didn't seem to bother him). His temp was up to 103 and I was giving him some motrin. Tuesday his fever was a bit lower and he was almost back to normal. Last night he slept great and his temp was 99ish. Today he has been pretty much back to normal but a few hours ago he had diarrhea and his temp is back up to 102, he is still playing though and eating. I also noticed yesterday his skin is a bit mottled or marbled, he is pale anyway and the mottling is barely noticable. I was going to take him to the doc if he wasn't any better today but his fever and the diarrhea came later in the day. Does this just sound like a tummy bug or virus? Should I be worried? What would you other mamas do?