I have Hashimoto's thyreoiditis
The symptoms started when I was 14 years old, and my mother took me to a endocrinologist, back then as wild attempt to see what was going on (we had no idea what the issue was, my mom choose the medic specialty in a sorta random manner).
The result was: medic refused to do any exams, told my mom that all my symptoms was because I was fat, and I was absolutely mad at my mother (because I told her that endocrinologists are medics for fat people, and I did not needed one, and then the medic tell me all my issues, including random pains are because I am fat, just made me offended)
Fast forward some years, my health was getting slowly worse, with other medical specialties trying to stave off the effects (For example research shows that seemly one of the first symptoms, if not the first symptom that shows up, is cholesterol imbalance... I spent years going to cardiologists that tried their best to fix my cholesterol, until one of them suggested some heavy-weight drug, and I decided to give up on that and let it run unchecked).
Until one day, a marketing director that was friend of my mother, saw me from afar, and told me mother I had a thyroid problem.
My mother puzzled, told me that... And I asked her more about it, and she then remembered (and then told me) that my grandma had it, my great grandma had it too, and my aunt had thyroid cancer because of the same disease (hashimoto disease can lead to cancer if left unchecked)
I was kinda baffled, I mean, lots of people had the disease, she never wondered about it? In fact, she had symptoms too (much weaker than mine, to the point I don't realized), and never ocurred to her too... and indeed, she went to a doctor and promptly got diagnosed herself (she also had the disease).
Now the important part: after that, I spent 6 years going to medics, and as my information grew, the more they went into "shut down" mode and refused to cooperate, I had to threaten one to get the exams I needed (she was a elderly woman, I stood up, and I am very big for my country standards, and stared her down, and told her to sign the godamn request for the exam I wanted), and this was the only way to get results (the exam I wanted DID confirmed I had hashimoto), but still no doctor wanted to treat me...
It was funny, I showed up, gave them ultrasonography showing my destroyed thyroid, and gave them my symptoms, and then they would ask for a blood test, that would give normal TSH, and then they would promptly tell me I was hypocondriac or something and my health was fine.
As this went on I got more and more convinced that medics are just people with a crazy power trip, seemly saving (or not) people lives makes them think they are some sort of god or demi-god, with power of life and death...
Several went to tell me that I was wrong because they were right and I would never understand medical research and whatnot and that is not what the association said.
I went for some time to hate the association, they are involved in scummy stuff, and they were all the time cited as the reason why my normal TSH meant no treatment for me...
Until I decided to read the association documents, and whoa, my own arguments, the same ones that I use to argue with the doctors, citing the exact same papers, are written down in the section that explain how to achieve diagnosis... in the end the association actually agrees with me, and is the medics that in their hubris don't even read it, or read it and ignore it, and lie to their patients.
The only reason why I still go to a doctor, is to get the permission to get the blood tests (privately ordered blood tests cost like 2 month wages, and I need blood test every 4 months so...), because I am mostly treating myself with my own knowledge (and so far it is mostly working).
EDIT: "normal" TSH as in below 5.0 (it was 4.0), and my argument was that they are using the wrong baseline, the association use 5.0 for general case, but the association cite studies related to my specific symptoms and situation that suggest that TSH should be below 2.5 instead... thus my TSH is "normal" only for the "generic" most conservative case
EDIT2: I started treatment just some months ago, I am 26 now (meaning it took me 12 years to start the treatment)