At some point it would become exhausting. You'd be mentally drained all the time; I honestly do not think it's the best to live life as if every day was the last, else you'd be missing out on life itself. Every single day that we are alive is a day that we experience life. Ups and downs are impossible to avoid, it's apart of it, but it's that experience which makes us happy to live - and thinking of every day being the last is allowing yourself to live in a parallel world, experiencing life as a mirage.
At some point it would become exhausting. You'd be mentally drained all the time; I honestly do not think it's the best to live life as if every day was the last, else you'd be missing out on life itself. Every single day that we are alive is a day that we experience life. Ups and downs are impossible to avoid, it's apart of it, but it's that experience which makes us happy to live - and thinking of every day being the last is allowing yourself to live in a parallel world, experiencing life as a mirage.