try entering safe mode, turn off your device(hold both home and power buttons,it will reboot, keep holding, it will turn off again, make sure it wont turn again, then release buttons) now, while turning it on again, hold the volume+ Button, it would take some time, but isn't it worth it to get your device back again?, okay it will show a respring wheel then, if it did, then your succed, remove the tweak or app that you think it caused the problem, and (ReBoot)
Heard it from:Barisaykut
OMG, the volume+ button trick just saved me a couple of sleepless nights! You're a genius (pun intended)!