Question

what would happen if the gravity disappears suddenly??

Answer 1

we'd fly off the earth because of the tangential velocity the spin of the earth causes

Answer 2

We would have many health problem like with zero weight, but zero gravity isn't full understood as Dr.Walter said.
In general we will use other force to catch us like electricity and all planets would move with constant speed maybe after 5 days , we would be far away from the sun and we would die.