It seems to be a depression.. but its not.. its the consequences of it... Unfortunatly Depression can destroy the range o positive emotions that we can express...and it last forever.Motivation is affected.
if you are in a process of " being crazy" , just like when you worry about everything and you deal with it, I advice you do everything to stop it, coz as time pass, more is the damage.I experienced this process, and I failed.what was the consequences?! I Cant feel well-being.I Can´t express a good feelings.. and also, feel like have any emotions.In fact, I can deal with it.. I like all days with it, I study, I work.. I have desire to grow in the work... but , I would have more quality in life, if I hadnt it.
What you are describing is actually one of many symptoms of depression. You feel apathy because you've lost hope. You've given up. You may not realize it, but that's what you are feeling. When you feel good about yourself and feel happy and hopeful about the future, then you care more about what's around you and the people around you. Have you tried talking to a therapist or tried anti-depressants. That would be my recommendation for you. Also, if you get yourself out more and get involved more doing things for others, you will feel better about yourself.