Very very sorry to hear about this.
I read the entire thread and each post, rather for a moment, I felt that you phone motherboard got corrupted because you tested many things in one go..
What I really wanted to understand is how and when this got started?
I mean what you did actually that caused you this ? Is it the OTA update of 4.4.4 or you updated to 4.4.4 ? and then the problems started ?
The reason, I am asking this is - I am still on 4.4.3 - rooted on stock rom, I got the OTA update, and the moment I start to update.. After the screen says installing update, it says no command and shows error. Is this what happened with you. ?