short version yes this medical condition exists. Andropause is male menopause.. a time in an adult males life where their body no longer produces what is needed for reproduction...a decrease in testosterone, a decrease production in sperm, ...like female menopause this can cause a man to be fatigued\needing to nap \sleep more or longer, decline in sexual urges\sex drive, can cause medically induced mood swings and medically induced depression, hot flashes, ...

treatment for it is...hormone replacement therapy (medication in the form of testosterone shots, pills or patches.)

my suggestion is contact your medical doctor, they will be able to prescribe the testosterone for you after doing some blood work and a sperm count to verify whether you are in male menopause (Andropause) or not. they will also have information pamplets on this medical problem most males go through once they hit their 50's but in rare cases can happen sooner or later depending upon ones own medical health.