What is burnout how long is recovery and does the experience of depression make u change?

Burnout is the resulting mental & physical exhaustion from pushing yourself to hard. Usually it occurs when people push them selves to hard with work & study but although this is rarely mentioned, it can also occur from extreme mental stress occuring from such neurosis as ocd or agitated depression for example. Symptoms are varied & can include fatigue, exhaustion, palpitations, high blood pressure, lack of interest, muscle ache, derealization, depersonalization, depression, anxiety, panic attacks... I surpose it's a way of describing a mild nervous breakdown ( a completely unnofficial term for a sudden mental illness)