It’s very hard to follow various issues on a same thread. Please open a new bug report if nobody already did it.
You will not destroy the phone, c’mon, 
do things step by step and one by one!
But id you have too many issues, it would perhaps be easier to reflash you phone. Or, did you make it already? I don’t remember.
One thing is sure: First, you have to do a backup.
Have you already made a backup?