Extreme bloating, need help

Hello everyone. I’m hoping that someone can tell me what I may be experiencing and how to help. None of my doctor’s take me seriously. Let me preface by saying I’m a 22 year old female. Two months ago I started experiencing dizziness, chest pain, and bloating. I went to the hospital twice in one week as the bloating continued to get worse and I didn’t get any answers. I got to the point where all I wanted to do was sleep because I was so uncomfortable. I couldn’t eat because it made me feel more full and uncomfortable, and it felt as though I had liquid filling my abdomen. The second ER doctor did a CT scan and said I had a “huge backup of stool” and gave me Miralax and told me to follow up with a GI. I took The Miralax but I was only passing water. The GI nurse told me to do a colonoscopy prep with the Miralax, but still nothing happened. Finally, the GI nurse looked at my CT scan and said that she saw no backup of stool...????? So they requested I get a colonoscopy and an endoscopy. My GI said I had a tiny bit of inflammation in my intestines and a bit of gastritis in my stomach. She diagnosed me with IBS and prescribed Bentyl (which I don’t like taking because of the side effects) and omeprazole. Eventually the symptoms subsided after about 2 weeks but now they are back. The bloating and distended feeling is unbearable, and now my stomach area feels hard and is making gurgling sounds. I also have some slight pain. Has anyone else experienced something like this?