I am very sorry for all you are going through. Sounds overwhelming!
Is there anything other than suicide?
You could make a commitment to living, at least a day-to-day commitment, as in One Day at a Time. That's what I do. I have been struggling with depression for many years.
My dad took his own life, which was tragic. Most people never forgave him for this. It was very painful to everyone around him. This option does not help anyone.
You could try treatment with a psychiatrist. You could also benefit from a therapist; yet, you seem to have ruled that out.
Feel free to post in the Depression Forum. I post there, as do many others.
I hope you decide to live, at least today!

WC