All Library and Playlists Get Deleted

[AbinSurErtu]

Hello,
I was listening my downloaded Playlist on Spotify and suddenly it stopped playing. Then I tried to play it but the app reset and restarted itself. For a while my external SD card seemed as disconnected although it wasn't. After restarting my phone, all my playlists and saved songs got deleted. However the app still uses about 5 GBs in my device storage. My Spotify app has been located in my device storage since I was downloaded it, so I don't think it's about my device. Please help me to listen my songs again because I'm on a holiday on Countryside, therefore I won't have a Wi-Fi connection for about a month. Is there any way I can restore my songs.
My device is HTC 10.