My Toddler Son Throws Up After Eating Egg Roll..?

My kids, fiance and I went to a chinese restaurant last night. We got him fries and chicken. My fiance and my meal came with egg roll and rice as a side. Well, we figured, he it’ll be good for him to try new stuff.. We both personally do not like egg rolls, but we don’t want our kids to be picky. My son was fine right before he ate the egg roll. After he ate it, he became “ehh”. He whinned and then went to sleep. He kept waking up. He laid next to me on the couch, he whinned some more and so I gave him a blanket. Moments later, I hear a big water like sound and knew right away he had threw up. So I took him to the toilet, and he finished that one. I gave him to my fiance to wash him up and change him, while I cleaned up the mess. My fiance just left to go and get some medicine, and I am waiting for my son’s doctor to call me back. As I have both my toddler and baby on me lol. I dont know if he maybe allergic to the egg roll? He threw up 2x’s(right when my fiance was leaving), he is very whinny, tired, coughing, nose running, breathing with his mouth open(which he dont ever do!).. i need advice/help! or maybe its jus a cold? but my kids and I RARELY leave the house…