Suggest Remedy For Abdominal Pain And Discomfort

I am a 25 year-old female from NY. Throughout my life, I have been relatively "healthy." However, I live in constant discomfort/ pain. My stomach has given me tons of problems. I was hospitalized twice as a child for gastroenteritis. When I was about 10, I was diagnosed as lactose intolerant. When I was in college, I was diagnosed with IBS. When I was 19, I had surgery to drain an abdominal abscess caused by seemingly nothing. Months later I felt a lump and returned to the surgeon thinking it was scar tissue, and he told me it was a hernia. My former primary doctor (I no longer have insurance) attributed my stomach pain to anxiety. A pharmacist once suggested I be tested for Celiac's disease(I have allergies to just about everything), but when I did research, I found that patients with Celiac's disease were typically underweight or suffered from unexplained weight loss. I (unfortunately) have always struggled with weight and have spent most of my life overweight/ obese. I'm starting to feel like a crazy hypochondriac, and living with constant discomfort is ridiculous. What should my next step be? I'm at my wits end.