Wrong words come tumbling out of my mouth at times, honestly. I have embarrassed myself before now too by mixing my words up - I have actually used swear words without realising. I get funny looks too at times, but like Glojer says you must learn to not take things too seriously when you do this. If we can laugh at ourselves, then this is such a positive step. I also totally forget what I have been talking about too, and just sit staring into space. My husband asks me if I am looking for divine inspiration. Nope, I just totally forget. I will just sit and stare and sometimes I eventually just let it go because it is too hard to even try to remember what it was I was trying to remember.
On the serious side though, you must obviously make sure that there isn't an underlying reason for this. I know with me it is because of my SLE. Just put your own mind at rest. Apart from that, just carry on doing what you are doing, it seems to be the right thing for you. I hope you continue to feel well.