I feel bad for you that you are having these problems. BEFORE you let your auto go to the repo man consider this;
YOU WILL STILL owe the loan and have to pay for the vehicle even if you do not own it. Since you are UPSIDE DOWN you may want to consider making the payments on it and not letting it go back.
If you have to pay for the car even if you dont own it, you may as well drive it.
If you decide to give it back as a repo, just to let you know they can NOT garnish your wages in Texas even if they do obtain a judgment against you.
I hope it all works out for you. Keep us informed and good luck.