I have hypothyroidism (likely autoimmune in origin, although I don't think anyone's ever actually tested this to confirm it). I also had a bout of benign intracranial hypertension (increased pressure in the cerebrospinal fluid) a couple of years ago which medical science is not yet entirely sure of the exact causality of, although they think weight may be a factor in triggering it (I did put on some weight when my thyroid packed up so this may have played a part). I have also always suffered from a lot of headaches, which I have never bothered the doctor with. I had a pulmonary embolism at 19 and
have had a colycystectomy due to gallstones.
Psychologically speaking I suffer from recurrent depression and anxiety and have been diagnosed with borderline personality disorder, although I think the latter is a misdiagnosis and even professional opinion is divided on that one in my case.
I feel like a hypochondriac most of the time, although every time I have been to the doctor thay have actually found something reasonably serious wrong with me.
BTW Have you read about the connection between autoimmune thyroid disease and gluten?