my game disappeared

Hi, my game Minecraft just disappeared, I just played for it 2hours ago, just for a short break, the Minecraft launcher told me to re-login for no reason. Then, I started to log in but I forgot my password, and I tried many times before my account locked. However, I unlocked my account then I log in to my game, I see nothing, it tells me to buy the game but I've bought it like 4years ago. Anyway, I went to Minecraft's website, my game id is still there, just can't figure out what just happened. Hope you guys can help me out. Appreciate that.