Minecraft Account Broken

So today, I was minding my own business, playing Minecraft (1.15.2 if that matters) and I closed Minecraft to play a different game, and I accidentally signed out of the launcher. I thought, "This shouldn't matter, I bought an account, and I know my login info!" But I was wrong. VERY wrong. When I logged in, my username was now 'Player' and the game wasn't bought apparently. All of my personal info (DOB, password, etc.) was all still there, and the games files were too, but my account just didn't work at all. I tried logging into my 2b2t client (I use Impact) and tried to log in with an "alt" (which would be my main account, I don't have an alt) and I couldn't log in, meaning my account was 100% deleted. I checked Twitch, where I hadn't logged out, and it did have my username there and the game was bought. However, when I clicked "Manage Account" it said I hadn't bought the game and my username was "Player". This was extraordinarily odd. My old username was SuperCrafterz and I have been playing Java since late 2017. Can anyone help me fix this issue and get my account back?