Nothing to Nothing

According to modern science living beings are intelligent and self replicating machines. Science says that living being are essentially made up of nonliving  things like carbon, oxygen, nitrogen, iron coming to together in certain way. This is an amazing fact to realize, that all the living is made up of non-living. But it also means that all the living experience we have  is only due to firing of some chemicals in brain. In a way what modern science means is that we arise out of nothing, live for sometime and would merge back into nothing eventually. This fact is deeply frightening, when I think about it. 

Death is inevitable, it will come to all of us. This fact cannot be denied. But the question which keeps me up in night is that. Is there anything more to our life, then our brief existence on this planet? Any thoughts on it please?