it doesn't sound like a gasket, especially being it just randomly went from no leak to massive... that sounds like mechanical damage to something, or a line melting or something... not sure what's on the drivers side though...
best bet, shampoo the engine, let it dry (without starting it) then get underneath (with it on a hoist, or you in a pit) and start it, watch for the leak to start
best bet, shampoo the engine, let it dry (without starting it) then get underneath (with it on a hoist, or you in a pit) and start it, watch for the leak to start