download music to iphone 7

after updated to iOS 11.1.1,

within iTune, can't find option to download musics that I had already bought.

and my bluetooth earphone quality had become unstable.

Camera capture is so strange, the photo become 1.5cm square. That doesn't

happen all the time. But it does.

I end up erase my phone through Apple's big help, and icloud *****!

passwords some how disappear. On first erase setup, my Facebook's

password is gone, but my messenger still works.

HELP!