Kindspirit i know exactly where you are at!!
Plain and simple.......... the medical system on average doesn't care or doesn't have time...... it's rare to find a doctor who cares or has an interest. I'm at that stage now with my own father. He will be 70 next year. Some years back he was told his thyroid was enlarged and they left it at that. The only tests his doctors appear to have done are TSH.
I've put all my own test results into plastic sleaves in date order into a folder. I'm going to do the same with my dads results. he's giving them all to me to do what i want as he simply feels he's getting old and it's part of old age. I'm trying to tell him that if you get on the right meds and get the right diagnosis you can actually feel somewhat better if not 100% better. Sometimes old people can be stubborn. He is coming around to my way of thinking or maybe i've simply worn him down and he's giving in
Now with me being diagnosed this year with Hashi's and a number of other family members on my dad's side having thyroid issues, i decided to take the reins with his medical tests. I wrote a nice letter to my mother's doctor and sent dad to him. I wasn't there at the time, but the dr told my dad that he'd do the tests i requested. He only did TSH and Thyroid Antibodies plus the B12 and a number of other unrelated things. Why did this dr bother doing TSH and antibodies, but not the T4 and T3, especially as i told him thyroid disorders run in dads family. I also requested he check my dads adrenals, but he didn't. i then went with him for his next appointment, took a day off work too, only to find out there was no adrenal, and no anything else.
To humour me the dr then said sure he'd run an adrenal test. It was only when we left the clinic that i noticed he'd omitted a heap of other stuff on the test results, so i sent dad back on another day to demand those other things. He did end up having low cortisol levels. Now the dr has given him a prescription for a mood lifting drug called Valpro which was once used for epileptics and nowhere on any research can i find it having anything to do with cortisol/adrenals. So that's where i'm at with my own father, navigating through tests and doing research so this doctor doesn't give him some drug which is useless, thereby wasting more time. My dad hasn't been the best for years and it's only now he tells me he has same symptoms as me. I'm hoping it's just his adrenals and not the thyroid.
Hoping you get your dad onto the right meds. He's fortunate he has you to look out for him