Woke up in middle of the night with extremely bloated upper stomach and nausea.i have tried to release it but coulded or tried to pass motioni couldn't.whn I tried sitting and standing I have got really long burps three to four ..like I have never experienced bsuch burps.which felt like there was gas trapped inside n it released ..really longgg burns n later I'm feeling throat soreness .but still have burning sensation in upper tummy. Is this simple gas or acid reflux of more complicated cancer or hearattack.