Sorry you had to go through all that. While unfortunate, your ordeal is the product of over zealous flashing and not enough reading. While you may have been a pro with whatever phone you had before, new phones sometimes require a re-learning process.
I also flashed the most recent version of TWRP (2600). Luckily, I noticed right away that there was an issue with it. So I posted about it before doing anything else and thanks to the good people in our forums (Shabbypenguin and nuttmeg), I learned that the Tmo S4 had issues with TWRP 2600 and as a result our (Metro) S4 would probably have issues with 2600 too. I was told instead to try TWRP 2500 (like dcap0187 pointed out to you) and it works great.
After your initial post and dcap0187s answer, I read that you flashed TWRP 2600 again, after being told that there might be issues with it. Why would you do that?
Lastly, we HAVE two stock Metro firmware images available. One for TWRP 2500 and another for CWM based recovery and both are posted in this very sub-forum. I haven't had the need to use them personally (i have my own working backup)...i'm fairly certain they are both working and are from the Metro S4. Here are the links again, in case you missed them....
[Stock Backup] Restore Using TWRP
stock no-root cwm based backup