I may have an ulcer. have fatigue. a little weight loss 3 to 4 pounds in 1 month. slightly loose stools. acidity in stomach. very slight tenderness in stomach when i burp. i'm 29 years old and i finished some antibiotics too. thoughts on this issue?

No way around it.: You need to see a doctor in real life. There are a number of diagnostic tests that you need to have after a complete history and physical. The possible explanations are enormous and to narrow it down you need a primary care doc to take the lead. Your family history and environmental history also will be revealing. A youngish person with weight loss, dyspepsia and bowel changes needs prompt eval.