So sad and yet so happy - Being overwhelmed

Has anyone been where I have been ? I am so heartbroken and yet I am overwhelmingly happy. Its so difficult to explain, but I feel both rock bottom and peak high of emotions at the same time.

I have personal sorrows which have taken life out of me, but I can be very happy when I see my friends happy. Ever since I have faced a personal tragedy seeing anyone happy makes me so happy, even though deep down in me there is so much grief.

Why does the pain overtake my heart when I hear some good news, I am not so sure. But one thing is for sure, the pain in me has made me appreciate life even more, I feel the happiness of everyone in me. I feel this strange union with the universe, as if everything in the universe is mine, and so is the joy and sorrow of everyone. I am of this world and everything here is mine only if I have a heart to feel it.