I forgot how to throw

 Take your time and relax. It's simply a game of catch from 50-90 feet away to your target. Hit him in the chest and call it an out.

Thinking is your problem.  Just go back and work on the mechanics of each part of the throw, and then put it together.  Use video to analyze what your doing.  After putting it together work throws from various distances and then start ramping up the intensity.  Then let your body take over, concentrate on the target and not so much on the throw.

My $.02.  It's like a chip in golf.  If you decelerate into it, watch out.  You need to accelerate thru the shot.  In your case, accelerate thru the throw.  Good luck. 

Thank you all.  It has been a very frustrating experience, lots of tears and doubts.  It's put a lot in perspective, and has actually made me think and take a step back and realize the simple things I should never take for granted.  

I've been throwing every single day and I'm always all ears waiting for more answers...

Thanks again

Weird how things seem to come together. Earlier today I was reading this: http://www.cracked.com/article...being-miserable.html which is nothing new for me but may be of some use for someone.

If you've worked with professional psychologists that's great. Positive self-talk, mental imagery, all of that is good if you haven't done it I'd highly recommend it.

You didn't forget how to throw, something is getting in the way of your throwing. Sorry, I don't have any cures for you, but I hope you know that many very good ballplayers have been through it.  It seems to affect catcher and second basemen most.  I think the common thread is the relatively short distance from both positions.  It takes your whole body to throw from F6, but just your upper body from F4.

Common sense tells you that this is problem of the mind, not the body, but trying to clear it from your mind is like telling someone not to think about pink elephants... You've already tried some alternative stuff, so you've obviously figured that out.

Here are a couple of active catchers who seem to be doing well now:
Jarrod Saltalamacchia
  http://sports.espn.go.com/bost...ordon&id=6103972

Grayson Greiner
  I haven't noticed that awkward hitch in Greiner's throws back to the pitcher this year (like in the video below).
  http://youtu.be/Luo9Om1B8s4

Best of luck to you, and you are not alone!  Even Rube Baker had the yips in the film Major League II (might give you a laugh).