Touch screen issues with IOS 8.3

My 5th Gen iPod is not even a year old, the touch screen and my battery life were perfectly fine before I updated to iOS 8.3 about three days ago. When I updated to 8.3, my iPod showed that the update had been successful whereas my computer iTunes launcher said that it update had not completed properly.

Since then my touch screen has been freezing, lagging, and becoming completely unresponsive. For instance, when trying to type the keyboard will completely freeze then begin sending messages or attachments without my confirmation. I have had to restart my iPod multiple times to get it respond properly again.

The battery life has also been significantly reduced. I used to be able to watch Netflix, play music, and constantly use apps without battery life going down even 50% for about 6-7 hours. Since updating, my iPod's battery life will only last about 2 hours of constant app usage, watching Netflix, and playing music before hitting 20% battery power. This is completely frustrating and inconvenient.

If anyone else had issues with the iOS, were you able to downgrade to the previous iOs? I am at the end of my rope with dealing with this glitchy iOs.