Try reverting back before 4.4, go to Sammobile and find older firmware for your phone and then download a program called Odin. Load the .tar file in the PDA section, untick repartition and flash when ready. good luck! (you will loose all data so back up first)
if you want to do things on your phone you can plug a wired xbox 360 controller or a wired ps3 controller and control your device with that