Stomach swelling

Patient: Hi I’ve been getting slight pain in my stomach after I eat it’s like burning and almost feels like my stomach Is swelling up I’ve also been getting dizzy sometimes nearly passing out and when I lie down on my upper stomach under rub age is bulging out more than other side I get very breathless and havnt been feeling myself for a few months now I’m only a 20 year old female very worried what could this be the bulging has only recently happend with back pain behind rib