I'm thinking he's just a normal baby with reflux.
FabFiona - thank you. All I've heard is "he's hungry, give him a bottle", "top him up", "it's time to sleep train him" and "he's manipulating you". It makes my head spin. How happier I feel thinking he's "normal". Thanks for the tip about the formula - I hadn't thought of that. And yes, he is my first baby - can't you tell?