This is Dr. David
I am sorry you are having all of these symptoms.
a simple blood test can check for your thyroid hormone levels to check for hyper or hypothyroidism.
you can't have both.
your symptoms don't sound like thyroid problems.
they sound more like possible autoimmune disorder.
or you could be having a neuropathy
you might need to take a mood stabilizing medication.
do you have a doctor you can see who can work with your regarding these symptoms?
at 80 , it is common to be more forgetful.