I logged out of my Apple ID to another id to download a song. I logged back to my ID and all my songs where gone. I went to my music I cloud and click on it and it told me that I am not allowed to sign in because accounLosot id is already used.

I logged out of my Apple ID and logged on a different id to download a song. I then logged back in to my account and went to my music and all my music was gone except the song I downloaded from the other account. I tried to download a song and it said I had to go to music and allow icloud to download music. So I went to itunes and Apple Store and clicked on music and then merge. It said music cannot be downloaded because iPhone belongs to a different Apple ID and it can not be changed in 90 days. I don't know what to do I can't download any music at all using my Apple ID