Why is iPhone5S keeps crashing after updating it?

Recently, I've been putting off updating my iPhone 5S ftom 7.0 to the current 8.3 for personal reasons. After finally having enough of the stupid error messages, saying I needed 8.0 or 7.0, I decided to update it. However, after it completed the download portion of the process, my phone attempt to "verify update…" which then caused it to naturally shut down and then reboot. As it began its first attempt to reboot, the Apple symbol and a loading bar appeared. A small portion of the loading bar lit up to indicate that it was installing (or something). However, it immediately went dark and then the regular Apple symbol appeared stayed there until the blue screen death just flashed and shut the phone down and repeated the cycle.

I've managed to stop the cycle with the force shut down but now I'm stuck in a loop and don't know what I can do. Can anyone offer some advice other then the obvious of taking it to the Apple store?

Alright, try connecting it to the computer, and try restoring via iTunes. If you do not have iTunes you need to get it, if you do not want to get it you need to take your phone into an Apple store so they can restore it.