I broke my phone recently, and have to use my girlfriend's old Android for the time being. I installed Pokemon Go and tried using my Google account to sign in. I was level 20 and had previously bought store items with real money. However, I am sent back to the starting screen with Professor Willow when I logged in. When picking a username, my previous username was already taken, so I know it's still there.
!!!The problem is that everyone is saying that I'm using a different email account than what I originally used. But I only have 1 Google account, and do not have a Pokemon trainer account. There is no possible way I'm using the wrong email, because, like I said, I only have one. There are no backups or linked accounts.
I've tried closing and refreshing the app, uninstall and reinstalling it, clearing the data, nothing is working.
How do I get my information back?