What is the advice for someone living in a state of terror over the death of a family member or loved one, and who is considering suicide to avoid seeing that day?

Be content with Allah's decree and submit to His judgment. Know that all of Allah's decrees are good, and that every soul will die at a predetermined time. There is no need for anxiety or terror, for what Allah has decreed will inevitably come to pass. A Muslim should accustom themselves to being content with divine decree, both good and bad. Their devotion to their Lord and their diligence in worship will alleviate the burdens of worldly calamities. Ask Allah for a long life for your parents and loved ones, spent in good deeds. Do not dwell on what you imagine, for it is a prompting from Satan. Strive in obedience to Allah, and occupy yourself with what you must do in the present, leaving the matter of tomorrow to Allah. And if something you dislike occurs, then be patient, submit, and await Allah's reward.