What do you think i should do. and what do you think i have?

okay so in aug 2009 i got really sick like the last week i had a really high fever and i was throwin up etc. Now its january and iv been sick over and over again so many times these past couple months. like iv been sick at least 1 time every month. In september i got sickk and had to miss school for a couple days in oct. i was sick 2 times i belive. november i got really sick and had to go to the dr. decemeber i got a couple bad colds and january i was sickk a for a week with a fever and pains and headaches. Now im like not feelin well again. My stomach has been feeling werid and i have this nasty greeen pooop -_- and its not normal. idkk what do you think it is? is it nothin or hould i get something checked out.. please tell me