Rinpoche gave the following advice on how to put an end to worry.
Rather than staying worried, recite Mani mantras to purify past negative karma, then there’s no need to worry. Everything dies—everything grows and dies, comes and goes—so our main aim should be enlightenment. All other things are not important.
A Kadampa geshe said, “The suffering we are experiencing now is our past negative karma ripening, so we should be happy it is finishing.”
Take blessed water several times a day, thinking that it has purified our negative karma from past lives, and visualize very strongly these four things being purified: spirit harm ,negative karma, sickness and obscurations.