I'm going crazy when this happens!!!?

Yeah! I have wicked bad ADD and this happens to me all the time, sometimes I'll completely say a different word and not even notice until people look at me weird and say something.

Doesn't really mean you have ADD you probably just have a stutter. Or you could be anxious when you start talking which throws off your speech. I am the same (or was) way when I was not on my medications. If i tried talking to someone I would stutter a ton and my words would come out mixed and wrong which made it worse since i was nervous to begin with lol. I'm not saying you need pills but just try to take a breather while you talk to get that good ol' oxygen and take out that bad Carbondioxide. This is a good article about it i found, read it.

Carbon Dioxide is released because it is in most everything we eat and is toxic to humans so we breathe it out.

You breath oxygen in order for you to live. You give off carbon dioxide in order for plants to live. Plants and animals are in a give and take process it's also know as "mutualism". Plants take in carbon dioxide in order for it to give off oxygen which can be very beneficial to us. While in humans and animals, it's in a complete opposite where in we take in oxygen and give off carbon dioxide.

i used to have this problem. I would get the word right on the tip of my tongue and just couldn't spit it out to save my life. The older I got, the more I slowed down, and the less it seemed to happen. I don't even remember the last time now...