You can seek treatment from a mental health professional like a psychiatrist or a psychologist. You can also talk to your family physician for an initial evaluation which may include a blood test to evaluate your thyroid function.
Burn-out is included in the 11th Revision of the International Classification of Diseases (ICD-11) as an occupational phenomenon.
Burn-out is defined in ICD-11 as follows: “Burn-out is a syndrome conceptualized as resulting from chronic workplace stress that has not been successfully managed.
It is characterized by three dimensions:
feelings of energy depletion or exhaustion;
increased mental distance from one’s job, or feelings of negativism or cynicism related to one's job; and
reduced professional efficacy."
Burn-out refers specifically to phenomena in the occupational context and should not be applied to describe experiences in other areas of life.
I notice that many patients presenting with burnout oftentimes would fulfill criteria for anxiety disorder, panic disorder, major depression, insomnia disorder or chronic fatigue syndrome.