IM FACING A LITTLE BIT SWELLING IN MY UPPER PART OF STOMACH AND ALSO FEELING VOMITING SO WHAT WOULD BE THE REASON?

See answer. Acute vomiting, and often diarrhea, is most often caused by an infectious gastroenteritis. The cause can be viral, bacterial or parasitic. Ginger tea often helps nausea. If your symptoms are severe or persistent seek medical help. For more information about gastroenteritis go to http://bit.ly/1vxEW0V.