help lol he has a appointment tmr but i just want to see what yall think

hey y’all, my son is 2 1/2 and since Sunday night he has had diarrhea and he’s been throwing up so originally he was backed up for a little bit like he was a little constipated. That’s always been an issue but recently he’s been just having diarrhea and throwing up for the past couple days so anybody know what to do I’ve been keeping him hydrated he hasn’t been wanting milk. I fed him actual solid food the past couple days but he’s throwing it up. He really won’t eat anything other than mac & cheese and hotdogs and I got him to eat broccoli the other day he eats his pouches like veggies, fruits, all that.