Abdomen pain and burning since 1week.

Hi I am getting abdominal pain in center and burning since week I have gastric prblm, last week I went to party and had little drinks aftr that I got hangover ...Mrng I got vomit , I had drink for the first time in my life, coz my cousin sis forced me... In that vomit I noticed few drops of blood a very little at the end of the  vomit, again I vomitted aftr an hour in tat I didn't find any blood in the vomit....tat day I was ok, from next day on again I got this abdominal pain and burning, I consulted doctor she prescribed Happi D tab for 1week I din taken the dose properly ...so again this stomach pain is started ... This pain looks like someone is  squeezing my abdomen ...so pls suggest wat I sud do ? Prescribe any effective medicine ... Thank you soo much