I have been experiencing pains in my abdomen both after eating and randomly for months. Any thoughts?

The Sunday before Thanksgiving (2010) after eating out at Applesbees I had horrible stomach pains, after that my world was upside down. I wasn't able to eat anything of real substance without terrible pain on my right upper side of my abdomen and the pain would shoot through to my back. It felt like someone was stabbing me. I had other symptoms including nausea, light headedness and a heavy chest feeling (which I was told was heartburn, I had never experienced it before.) I also would get pain in my lower right abdomen. I also have been constipated on and off but it seems to be regulated now. After about a week of pain I went to the Emergency Care Center (ER alternative) and the doctor thought it was my gallbladder and I should see my doctor. I didn't have a primary care doctor so over the next 3 weeks I was trying to find someone taking patients. Finally I got one! I went to the doctors and he sent me to get an ultrasound, blood work, and x-rays and the results had nothing to tell me. Not my gall bladder and liver was healthy. The pain continued so I sought out alternative medicine. I saw an iridologist who said I had a bacterial infection. After a limited diet of no white flour, no white sugar, no dairy and a variety of vitamins for intestinal and gall bladder support, still no help. Upon my second visit to the iridologist he put me on a very strict diet called the candida diet (you can google it to read more) but basically you are restricted from anything that will encourage yeast growth including wheat, fruit (except berries), dairy (but plain pro-biotic yogurt is ok), white sugar, honey, or any processed/refined sweetener, vinegar, etc. Basically you eat really really healthy and its hard. While on the candida diet, I went to a chiropractor who said my lower back was compressed and my right hip was shifted and not aligned. I saw her twice a week for 3 weeks and I started to feel better. I still had random pains in my abdomen but not as often or as severe. Two days ago I ended the candida diet and I started eating like a normal person. Yesterday I ate, plain yogurt with berries, french onion soup with a grilled cheese on wheat bread, and I started not feeling well (really bad heartburn, I think it was anyway) so I made beef stew with biscuits, both were gluten free. This morning I had yogurt again and a slice of whole grain bread with almond butter and I already feel awful. No stomach pains really but really bad chest pains, the heart burn feeling. I took some Pepcid AC but it doesn't seem to be helping yet. Does anyone have any ideas???? I am up for trying anything!!! I just want to feel good again. I thought maybe I have a sensitivity to wheat but from what I read that doesn't sound correct. Please help!!!