When the body ceases to exist, everything disappears.
Sorry, but this is just an assertion. You don't know this.
The best neuroscientific minds in the world don't even know what consciousness really is, or how it relates to the brain exactly.
Ok, there are neural correlates of consciousness (NCC's), which seem to be sufficient to give rise to conscious percepts, but we don't know if they are a necessary condition, nor do we know what the nature of the causal relation is (or if there is any causal relation, e.g. identity theorists in the philosophy of mind believe that conscious states may just
be neural states, and if a=b then there is no relation so to speak, apart from one of identity).
For all we know, consciousness may precede and be even more metaphysically basic than inert matter; when living organisms have conscious experiences, they are tuning in, like antenna receiving radio waves, to a more fundamental consciousness which somehow underlies reality.
We just don't know.