did your boy cry every night at a certain timing? maybe his gut is not mature yet like what my mum has mentioned and if it is colic due to immaturity may experience on n off some gas or slight discomfort etc that's why they stiff their body so it is very important to really burp them. my gal has been crying every night same timing and vomit quite frequently and it can be quite scary for me even for the first 1 to 2 month for her and even mention to PD and she suspect colic and prescribe probiotic from biogaia for her gut. Depending on her milk intake at that point of time so will likely to divide 1 feeding to burp her in between for maybe 2 or 3 times but I still carry her to feed and PD advises to give her more but small feeding each time. you may want to explore diff types of burping technique and to consult your PD. drinking aggressive sometimes maybe he is at the stage of growth spurt which he is drinking more than usual but his body may still not adjust to the higher volume intake but still wanted to drink more.
My ger has the same problem!! She doesnt even slp... and she spits milk out as well.. trying out dr brown now too...