Depression can have lots of different kinds of symptoms. Emotional numbness is one of them. The only real way to know if you are experiencing depression is to go to a professional. You need a complete check-up to rule out physical problems. Being anemic can cause feelings of depression, also thyroid problems.
It's best to go to a Dr. before making any decisions. There is a lot of information on this site that you can read that will help you also.
Good luck