I have a problem. I’ve lost my libido. Don’t know how it happened but I can not lust even for the prettiest girl. I feel that it happened suddenly about 4 months ago and is yet to resolve. I still masturbate because I am used to it but I do not feel pleasure anymore, and my penis is losing rigidity if I stop stimulating it, and I get very anxious when I masturbate for more than 10 minutes.
What happened?

ANSWER
You’ve exhausted your hypothalamic-pituitary-testicular axis and lost your libido. Heightened levels of prolactin are to be expected as well – the mentioned prolactin is actually protecting you from killing yourself.

You are anxious through a strong fight or flight response by the sympathetic nervous system. It occurs when your modulation on inflammatory / excitatory response is weak and your prolactin, norepinephrine, epinephrine, and cortisol overshoot.