Why isn't my 4-month-old ever satisfied?

My 4 month old son from day one has had a never ending stomach. He has GERD, and the fact hes got such a huge appetite, my Ped. said to but cereal in all his bottles. And to put in enough to make it thick. So there was never any measuring. This worked for a while, then he got to acting like he did before…never being satisfied. So at 2 1/2 months I was given the okay to give him baby food through a bottle and a large nipple, a few times a day. This only worked when I gave it to him, the other plain bottles with cereal… He would want more… But having GERD if I gave him more, hed spit it all up. I’ve basically been putting up with it trying different schedules and such… And now hes 4 months and 1 week old and he eats a container of food through a bottle every few feedings, 4 oz bottles sometimes with cereal… Sometimes the plain ones dont work. Hes always hungary… When he sleeps during the day its only a couple 15-20 minute cat naps. Once in a blue moon hell sleep one or two good times for an hour. At night he gets a container of fruit, a container of cereal, gets his bath, then gets 4 oz cereal bottle and goes to bed. Sleeps for 3 hours and is up every 2 hours to eat. Through the night I give him cereal bottles. Because regular ones wont even hold him for an hour lol… Im completely out of ideas and I relocated to NC and I dont go to this Ped for another 2 weeks. I dont know what to do? I get told all these things… NOTHING is hurting him. Hes pooping fine, never gets belly aches… hes just so hungary!!! Anyone else experience this? What the heck did you do!?