Not to worry, your Spotify Premium isn't gone - it sounds like you might’ve accidentally created a second account and signed into that one instead. I'd recommend checking out the FAQ page "Can I create multiple accounts?" here for more info.
Thank you for your Reply. But - I also checked Facebook, there is no account listed. And I just have one mail address, so there cannot be a second account. Also I checked my Inbox I have found all of the Paypal Transaction Mails from Spotify. They have charged me again for this month it is exactely the same email address from the account Im in Right now. Or could there be multiple accounts on one mail address?
thank you so much for your effort and your postings. It worked, seemed, that I really have an Facebook-Spotify Account. I have tried to Login before with my Account and checked the app Settings in FB. But with the username it worked. Thank you so so much for your help.