I have moments when I feel I couldnt care less - I find this helps me though - Like a release of the intensity that I did have a few months back - It was all too much at the time and I believe I begged to universe to release me from it several times.
It may sound a silly question to ask but, are you on any medication? has your diet changed at all?
There is the possibility you are being so angry because of having picked up on a negative energy? - When I used to suffer the anxiety and anger of someone else I thought it was mine - I did not give a damn about anyone else at the given times.