Ecclesiastes 5:16, alt rendering; but really, common sense. You have
no idea where you are 'going' after you die, and no one on this earth has any more knowledge than you on the matter.
And, as much as most 'ordained' people might like to think that they can 'reassure' someone here, they cannot; and they contradict Scripture--which I can also find for you--when they say they can.
Thank you, God, for taking such good care of me!
'Tomorrow' is a figment of your imagination, folks; and God does not want you 'dwelling' there. All the answer you will ever get for 'tomorrow' is intentionally poetic, flowery hyperbole, because your mind is not equipped to understand the reality. Today has enough challenge in it for even you.