Re: excuse me
Sounds like a nightmare scenario. I'm lucky I've never really had the yips with my serve, I've done 3 consecutive doubles a couple of times before though which feels pretty bad!
The only advice I can give is to practice practice practice. Get your serve so solid that the thought of hitting a double fault will never enter your head. Also, how good is your first serve? At high standards of tennis, you should be hitting the second serve as hard as your first but applying more top-spin to bring it down into the court or hitting around the side of the ball to apply slice. Check out any tennis manuals or youtube vids for how to hit a top-spin / slice serve if you don't know, or just ask a coach.
If you have matches coming up pretty soon, then just hit the serve really slow to get it in, or even hit an under-arm serve. Of course, your opponent will most likely pummel it, but at least they have to work for the point rather than you giving them a freebie.