crying after finishing a bottle, what is going on?

Okay so for the last week my 11week old has been crying like I'll feed him half to burp him and he starts crying so then I'll give him the rest and go to burp him and he starts crying hysterics like he's still hungry. It doesn't matter how many ounces I give him, he still criesband eats every 4-5hrs except at night cause he sleeps so he goes 6-8hrs. I feel so bad for my poor baby boy but after a few minutes he stops crying. The last he did was when he was a month old and it was a major growth spurt. He's been spitting up a lot the last month sometimes it comes out his nose and his dr says he's fine not usually a problem unless he's not gaining weight or seems to hurt him which it doesn't. I just feel so helpless.