Abdominal bloating, nausea, weight gain, back pain, fatigue for months now

This concern dates back over 10 years now and no one has been able to give me any answers to make it better. When I was in my early 20's, I would experience bad abdominal cramps. I would bloat, throw up at times, and feel very lethargic. I got sent in to get a colonoscopy done, but they did not find anything. I even had a laparoscopy done to rule out to rule out any gynelogical problems. That, too, came back normal. Sometimes I eat normal foods..even bread or rice and it happens. My stomach will bloat so bad that I look 4 months pregnant. I can't fit into any of my clothes, and my face looks puffy. I also gain weight in my back and thighs. It happens for days at a time. I just learned to live with it and gave up on it. Recently, I've the worst of it. In Jan. of 2008, I gave birth via c-section to my daughter. I decided to go back on birth control about 6 months after that. I decided to go back on Yasmin, but then, because the insurance wouldn't cover it, I started to take the generic version. I started to experience all those symproms all over again. Plus, I gained about 8 pounds. Weight gain does not run in my family and I'm usually at around 112. Currently, I weight 126! Oh, in 2006, my pap came back abnormal and I had cervical cancer cells. But since then, my paps have been normal. This year, 2009, starting at about March, my abdominal bloating has gotten worse. I went off birth control around then, and have completed stopped taking them. For the past month of so it has been the worst for me. As of today, I was dizzy, nauseous, loss of appetite, and my stomch is very bloated. I've also been having really bad lower back pain. I'm scared to eat anything and I feel horrible. I've taken 2 pregnancy tests to be sure and the are negative. I've done food journals, but haven't been able to find anything suspicious of an allergy. I plan on going back to see a gastroenterologist this week, and seeing my OBGYN next friday. I'm really thinking about seeing a doctor today, but thought I'd post this first for any help. I'm tired of being so uncomfortable and in pain. My self esteem and body image is shot, it is affecting my marriage because my libido is drained. I'm grouchy, snappy and tired all the time. And most importantly, since I'm a stay at home mom, I need my energy for my daughter. I used to be so active, vibrant, happy and slender :( Please help!