There is no certainty in life except death. And death is necessary to make room for others. It is the natural, inevitable cycle on earth. There is no other way for everyone. No exceptions.
An added problem for us is attachment. We create some of our own worst suffering with attachments to people, to things, to wishes, desires, cravings, etc. We can help ourself by accepting what is and doing whatever we can for ourself and others. Be in the moment. The past is done, the future unknown. To be in the moment, there is yoga, tai chi, meditation. Can work wonders.