15weeks cant keep anything down. not morning sickness or bug

Every time i eat or drink, about 30-40 minutes later i feel sick and then throw up. Im not nauseated before hand, im actually hungry! But i just throw everything up! And then i feel fine. 30 or so minutes later, im starving again with hunger pains. 
I have no other symptoms than that. 
Idk what it is! Anyone? This is going on 24 hours. Im calling my dr. Tomorrow if im still throwing up in the morning. Does it sound like something to worry about?
Also TMI: but i have yellow colord solid poop.