Music just dissappeared from my iPhone5 iOS 8.3

Hello,

I have between 7 and 9 GB of music in my iPhone, the latest iOS installed weeks ago, I'm listening to my music daily and all of the sudden, May 4th 2015, I open the music player and it shows 'no content, please go to the store'. There is no other option, no buttons, no folders no settings, NOTHING, just a black screen with this message and the button for Itunes. I do a force restore(press power and home in same time), still same thing. Next day, after second force restore, I get back the usual music player screen and i am able to restore the music I got from Itunes (the free Us album, etc.). MY MUSIC IS STILL MISSING.

THE STRANGE PART is that before this happened, i was using 27.3 GB of memory..... today, with 7 to 9 GB of music missing, I still use 27.3 GB of memory...

Any ideas?!