32 year old male

Symptoms.

Feeling hot all the time
Experiencing random hot flashes
Exercise intolerance
Heat intolerance
Worn out on physical exertion
Muscle weakness
Minor weight gain (5 pounds)
Body heats up more at night
Night sweats
Wake up feeling tired no matter how long I sleep

Also I am never hungry or thirsty. And I have been like that for a long time now. But all the symptoms have been going on for 5 months.

I appreciate any help on what you think it could possibly be causing all of it.

Thank you.