I can't say much about the sciences, a TS19 is a respectable score.
But your QR and PAT leads me to conclude that you didn't prepare at all for these. I mean what happened?
As far as reading goes, I think all this talk about piano passage freaked you out, so when you saw it, you collapsed mentally lol, don't worry about it, on the retake, you'll be fine, chances are you woun't get the piano passage again lol
Look I know your upset, just take the next 4 weeks off from EVERYTHING. Relax your mind, then start preparing again for the DAT.... This time around, focus all your energy into PAT and QR... I know you got Crack DAT PAT 10 test version, try to do it with this method (
http://forums.studentdoctor.net/showthread.php?t=675995), It might help you, I also started off with 17s on Crack, and ended up gettin 19-20s by 8th test....
As for the math section, I highly recommend MATH destroyer, if you master those 400+ problems in this book, your going to be MUCH better off, a lot better than a 13
Now the reading, I am the LAST person to give advice since I "winged it" on my dat. My strategy was simple, DON'T USE ANY METHOD, no search & destroy, no writting crap down, nothing, just let your instincts carry you through the answers.... I know this isn't the best advice, but I was SOOO sick and tired of always scoring 14-16's on my practice passages using those various SDN "methods" that I just gave up on them and decided to use my instincts.... I was either very lucky or my plan actually worked out, I got 19 on the real deal