How To Overcome The Inability To Control Emotions And Feelings?

Hi, For the past three years I have felt like something is wrong with me. I was always able to control myself and my emotions but now I am a mess. I can t control my eating, am always afraid of losing my friends but generally feel numb. I don t understand it, I feel numb but the simplest things make me extremely happy or upset for a few minutes then the feelings are gone. I don t understand what s happening with me.