I had a head injury a long time ago (22 years) and I still say really offensive and inappropriate things....?

...ocasionally. I just did it again tonight, and I mean really awful. I think I've manged to offend more friends. I seem to spend my entire life applogizing for the things that I've said. Does anybody know any mental exercises that will help me stop doing this??? I'll be more greatful than you can imagine if you can stop me doing this.