I got the same issue. I was shot by a player, he was using a shotgun. I died instantly. Then a horde of zombies rushed to beat up my corpse on top of that. No "you are dead" screen came up, but my blood was below 0. I pressed abort and went back in game. Spawned with a hourglass, bleeding, and at around 6000 blood. Cant do anything/bled out. Log in, same thing happens. I tried pressing respawn/restart that normally resets your character. I saw no "you were killed" message, but when I joined game again I spawned as normal at the sea. So, wait for the bleed out, then press respawn and abort. Log back in and you should be able to play.