What Causes Polyphagia?

Hi, this has just started around the beginning of this year, but I noticed that when I m standing still for a short period of time, or this also happens when I m walking, I get this very sickly feeling in my stomach, like I m extremely hungry. so I would usually eat something or drink something. But I ve found that eating and/or drinking something has just made me feel sicker faster than when I wouldn t eat or drink anything. I also get this cramping feeling after I get the feeling that I m extremely hungry. and by that time my back also starts to act up, I get dizzy and usually come close to puking. I ve also been curious about my back, since I m very young. I would think that your back wouldn t go inward towards the bottom, where your tailbone is, but I might just be wrong. something just seems off about the depth it goes towards my stomach, and I wonder if that s the cause of my case. it could also be nothing, and I m probably just a worrywart! but I would be pleased to have your opinion on it.