I went through the same process for the most part in 2014. A virus had set off 4 different issues at the same time, MD's had not clue, and I to solve the problem myself, the seek the right specialists, on my own...
Kind of like today's clueless car mechanics. They are even more clueless that they were 45 years ago...
My niece went for years, off and on dealing with crazy shit before they asked the right specialist, and he said it was obvious to him with even running a single test. He was right, it was Hypothyroidism ....