I have severe stomach ache and when i burp it burns my throat i have to trow up to get some relief from the pain and now my urine is dark yellow?.

Intestinal problem: The belching is probably due to inadequate acid in the stomach that gives a gaseous digestion and that causes belching that burns. Take some apple cider vinegar if you have that and it will; go away. Dark urine in dehydration most probably and taking enough water will hydrate you until you get a light yellow color to the urine.