I had something that is somewhat similar happen to me when I still had the mercury amalgams in.

I would be working on my computer and suddenly I'd have the impulse to get a drink of water. I'd find myself in the kitchen looking for water before I realized what I did. This mostly went away after my fillings were removed.

About short-term planning...

I can also relate to this. When the fillings were in, trying to organize my day was so difficult because I could plan to do something at a certain time, then started thinking about the thing I would want to schedule immediately after that and forget what the previous item was. Very, very frustrating.

This is completely gone now. I had my fillings removed in July of 2000. Here's a like to my story in case anyone is interested...

My Mercury Amalgam Story

Here's a like to several other mercury stories as well...

Mercury Amalgam Stories