I am an emotional roller coaster: Extreme, deep, anxious and completely unpredictable

My emotions are crippling me. As a child I used to get so anxious that I began to go through derealization, which is when reality suddenly feels unreal. This used to happen quite often, several times a day. Now my anxiety is way better but my other emotions are taking over: Anger, sadness, happiness...I'm sooo emotonal these days...I get teary eyed over so many things, something that never use to happen before. What makes this worse is that I'm in a relationship with a guy who is emotionally unavailable half the time, and doesn't want to let me in. Right now I'm focused on being well and functioning to my best ability, I'm tired of being cripple...I want to learn how to manage these emotions so that I can walk.