I get what you mean by going on what you've been told by doctors. When there was something off with my T cells in my immune system my doctor overlooked it or wouldn't have mentioned it to me if I didn't point it out. When I did point it out, he didn't know much about it. So, he just said the more blood tests you take you're going to find something wrong. He said nobody's perfect or has something wrong. But he won't tell you if there's something wrong that he isn't experienced with. I agree that you should always ask the lab or doctor for copies of all blood tests even if they said everything was normal.
About the gut dysbiosis...I recently had a chinese facial reading which gut dysbiosis in small intestine was suggested as the cause of hyperkeratosis.