Help Me Choose which meditation i Should do Anapanasati or Brahmaviharas?
Brahmaviharas is a lower type of meditation than Anapanasati. In Brahmaviharas you use your intellect, to make up suggestions or narratives, that condition your point of view a certain way. In Anapanasati you don't use your intellect to generate anything, you just let go of hangups and let them dissolve. Anapanasati is more direct.

The Buddha said, we don't have to rush to finish the with-intellect meditation and jump to the direct. In fact, he said we should max out the first type until we had enough of it at which point it would seem too artificial. I think that's exactly where you are at. 

So at this point it makes sense for you to do Anapanasati. However, it sounds like you misunderstand what that means. Anapanasati is not just watching your breath and disconnecting from the world. It is using the breath as a focal point for directly seeing your mind, and cutting through any negative thoughts that assault you.

The end result is that you come back to a fresh open mind, as if you have just awoke.