Ok so I randomly lost half a heart at my base in the wild.. No monsters, fall damege, ect. after about two minutes it hurt me down to three hearts until I disconnected, now when I reconnect Im stuck inside the world and my pick doesn't break the block my head is in
Looks like you're in the water and drowning. I see you have some fencing. If you can place it, you may be able to breathe, then you can find a way out of whatever you've gotten yourself into, or at least have time to open the debug console to see your coords.