What is life about?

So everyone asks what comes after we die but the question I want an answer to is what came before? Because if you really think about it how can we not exist one moment and then exist the next? Every time I try and think about it I get a massive drop in my stomach. Obviously no one’s gonna have an answer to what I want to know but does anyone have an opinion?

Sorry if this isn’t seen as a crisis it just seemed most appropriate while re visiting this thought.