I personally think you should go to an endocrinologist.

First, endocrinologists are internists. So, they don't go so easily into the DSM route and are less focused on one system.

Second, You already have a proven endocrine disorder and a family history of one. So, it makes perfect sense to consult an endo.

BTW, it was an endocrinologist who first thought I have MG. He put together my recently diagnosed " asthma", my significant weight loss and the mild difficulties I started having in climbing steps and doing more strenuous activities I could easily do before. He thought the mildly abnormal thyroid test results I consulted him for were not significant and did not explain any of my symptoms.