I think a psychilogist WOULD actually help here. They help greatly in changing behaviors by making you do things. Theorizing and meditating or doing whatever the buddism might possibily be about, in my opinion, won't help you much in practice. You need to focus less on the problem and work more on practical steps to improve yourself.

Par example, you could try to lower the ego-centrism by paying more attention to others.. here's one: Try to find a reason to compliment someone, one of your co-workers perhaps, and do so.