Hi @ak999, sorry about your experience — I am 27 and am having/had a similar experience (minus the lesion). I can only speak to my circumstances, but I have been dealing with abdominal pain, shortness of breath, and some other symptoms since November (started complaining in January). I went on omeprozol and then pantoprazol and nothing helped. I stopped drinking coffee and highly acidic foods, again to no avail. No alcohol since January. I had endocscopy, esophageal manotremy, a barium swallow test and a PH test and the Gastorenterologist in my home city told me that this was all in my head and to stop focusing on myself.
HOWEVER, I was fortunate to see a doctor at Mayo last month, and she sent me for some tests that showed I have a problem with my pelvic floor muscles where the anal sphincter is not relaxing when it should, causing fecal matter to build up in my lower abdomen. She believes this may be causing my abdominal pain even though my pain was/is up behind my ribs. To help resolve the issue she told me to take miralax daily and to participate in physical therapy geared towards my particular evacuation disorder. It took some time for me to get in with my local pelvic floor PT program, so I just had my first session this week. I am optimistic that the program will help. Additionally, I have found that the miralax has helped a little and that my abdominal pain is already reduced. Not sure if you experience constipation, but if so it may be something to look into. This was something that my local doctors (many, many doctors) had never mentioned to me so I wonder if it could be the case for you as well.
Finally, over the past two months I have also been doing acupuncture and it has helped a lot with pain management so it may be worth considering for you.
Best of luck,