I’m bloated enough to buy new pants yet losing weight, and I still can’t afford the endoscopy yet

My mother say that ever since I was a baby, my gut clearly had a hard time getting things moving. As a kid I had a lot of constipation issues and as a 30 years later, my gut issues prevail. Things came to their first head when I was in college. Mysteriously, I became so weak I could barely walk, my joints both weak and in pain (it felt as if my joints were made of a hunk of jello with wire tied tightly around it), I would fall asleep constantly, my skin hurt to the touch (of anything, including fabric), and I threw up every morning. I was tested for everything, from cancer to arthritis, and all came up clear. I was prescribed an Autoimmune Paleo Diet and while it was a profoundly difficult experience with lasting repercussion (ten years later I still do not enjoy food and I lost weight that I did not have to lose and it took nearly a decade of lifting heavy weights to gain back), it also changed my life. It cured my symptoms and I discovered a plethora of food sensitivities and unveiled a range of symptoms (like, vertigo from chickpeas and bleeding gums from almonds). I'd like to note that the majority of the sensitivities were from the food I was eating most often during that time period. Ten years later these food still give me problems. Ever since, I have good years and bad years, but this year has been a Very Bad Year. I am bloated to the point that I've had to go buy all new pants, yet I have lost 10 pounds, I am constantly nauseated and have air bubbles in my throat that my boyfriend can hear gurgling "constantly," in his words. My upper abdomen hurts and burns often, I am terribly gassy, I fluctuate between diarrhea and constipation, about once a week I get so cramped up I can't stand, the list goes on. I tried Low FODMAP and while that helped a lot, my symptoms quickly came back. My list of food sensitivities is growing at an alarming rate. My labs came back fine, I had several ultrasounds of my abdomen, and I have been prescribed a endoscopy that I can't afford. I am waiting until January, for my new FSA to kick in, to do the endoscopy, and in the mean time was today given a round of xifaxan. Additionally, I take Omeprazole which has been pretty life changing, reducing the nausea and cramping, though not eliminating it.