My 18 month old boy has 12 teeth in and is on his first eye tooth. It began poking in 2 weeks ago. He's had diarrhea for 5 days getting worse then better then worse again. He's begun puking a bit and has a cherry red rash from tummy to bottom. His granny said it's all normal all babies do it, but it's begun to worry me. He won't eat anything at all and doesn't want his juice cup. I've hand fed him the past few days but he gets sick and it all comes back up. Should I take him to the doc? Is this at all normal? Please help.