I'm on Android 5.0.1. Yesterday, I received several "Unfortunately, Google Play services has stopped working" notifications, which I ignored as I assumed whatever had crashed would restart.
But when I went into my Gmail app later, instead of seeing my inbox, I was asked to add a new account. Then, I checked Accounts in settings, and my two accounts were still there, but would not sync. When I try to remove the accounts, nothing happens (i.e., I press the "Remove account" button, and the phone simply does nothing).
I can connect to the internet consistently. However, it seems I am not receiving push notifications from any apps, including non-Google ones like Facebook messenger. And I cannot open other Google apps, e.g. Play Store (when I try to, I'm met with a blank white screen).
Any help solving this mess would be much obliged!