Obviously you can flash the stock rom again with SPtools but you WILL lose data. If you plug your phone in whilst booting, does the PC see the phone to get access to data that way?
I am guessing you didnt do a backup before you tried flashing recovery and SU?
Off the top of my head, the best course of action is to get recovery properly flashed first, keep trying that and once that is done you can at least back up the current rom your phone has on it unless you have wiped that already with a bad flash.