Stomach Ailment. Or less. please help.

I am having this problem since past 7-8 months. Whenever I am eating food, it feels that it is moving very slowly down the esophagus and sometimes, I also feel that the food gets stuck there. Sometimes, I vomit after my meal and sometimes it happens during the time of eating. The vomit surely happens, when I feel that food is stuck in pipe and I drink water, hoping to push it down. The problem occurrence is 40-50% of my meals. Sometimes, when I drink a lot of water before sleeping, I get up after a few minutes coughing intensely and vomit some water (not food). But again I drink water and go to sleep peacefully. No problems on second time. I get excessive burps especially in morning. Sometimes in morning, I feel gas rising up in my head or chest, which pains immensely, but on drinking water, the pain subsides in a few seconds. I used to smoke 6-8 cigs about 4 months back, but now cut down to 1 cig a day or even less. Alcohol consumption is once in 15 days or less. Please help.