1 year old vomiting, stomach discomfort,

My 1 year 10 days old son is vomiting whatever food is being fed, and he seems to be in pain. He is lethargic now and is cranky. He was fed watery suji upma today morning, which he kind of vomited partly in the noon after being fed water. He is also not very active today and has been crying continuously. His stomach was also feeling a little full. His stool looked a little whitish. Afternoon when we fed him khichdi after he woke up and after a long gap, he had a few spoons than threw up again. Now he just wants to lie on ur shoulder. He has only been fed breast milk apart from the morning suji. He is not even drinking sufficient water. And now i feel that may be his body temperature is slightly higher. Kindly advise. For your information, he has had cold on and off for some days now. And he usually has 4 servings of solid along with 3 breast feeding sessions.