Can one re-learn emotions?

I have felt numb and emotionless for almost seven months, and now I want to try to “re-learn” my emotions. I want to put feeling behind what I say and do. I just forgot how to feel things. Happiness, anger, sadness, love, jealousy…even thinking about those things seem forgein to me. I see this as nearly impossible, but I see people living and I want to be that way. So, can emotions be re-learned.. and how do I start?