Contracted Bronchitis. Why Am I Allergic To Smoke And Have Lack Of Thirst?
Your predominant symptoms do appear to be fatigue and lack of thirst that is also referred to as adipsia.
Hypothyroidism is a known cause of lack of thirst, and as you already have proven hypothyroidism, it is important to check that the current replacement thyroxine dose is adequate. You will need a TSH, fT4 test to know this.
I hope you have had a Chest X XXXXXXX to make sure there is no pneumonic patch of a consolidation that has remained untreated that can affect the salt water / potassium levels.
Also important is to know the sodium levels, and if that is high, would explain the feeling of lack of thirst. As the thirst center is located in the hypothalamus (brain), a CT scan may be indicated if the above conditions discussed do not apply to your case.
If you have ever had a history of brain problems, do consult an endocrinologist with this history of no thirst at the earliest.
I hope this was useful.
Best Wishes.