Wow. This is way too real. Im so sorry.
I can't imagine your despair. It seems like you were totally blindsided. My sincere condolences to you and your family.
My mother, who is about to turn 60, is a chronic major depressive who's taken anti depressant and anti anxiety drugs for the past 40+ years. She has tried to take her own life twice. The last time was Christmas of 2004. I had just moved out of the house and into an apartment with my girlfriend for the first time.
Ever since 2004 I feel like any day could be the day if I dont show enough love. Also, I have the same unipolar massive depression she has so I understand her. She feels old, she feels tired, she looks at living like a job, and wants to quit. Just like me.
After reading your post, I had to empathize and express my feelings, as it hits so close. Your story is a very real reminder to me to keep up the fight, for myself and my mother.
Stay strong, fellow.