Sounds like the story of my life.   I am 54.  I was having trouble swallowing and went for a camera down my throat test.  Whatever they call it.  The doctor found nothing unusual till he got to the beginning of my small intestine .  My small intestine was swollen, inflamed and scarred.  He biopsied and discovered I have Celiac disease.  An autoimmune disease that is triggered by gluten.  I have been gluten free for 8 months and I have no more of all those horrible symptoms you've listed!!!!!!!!  Try going gluten free for awhile and see if you feel any better.  I was super sensiive to even products labeled gluten free.  Some have cross contamination.  Try eating even without those products.  Good luck.