I'm sorry to hear of your attempt and glad you are safe and communicating now.
I agree with everyone that a group home is a good option.
I have been where you were many times, though I did not follow through on my plan. The reason I didn't is because my mother killed herself when I was a teenager and I know the feeling of chaos of losing a mother this way.
The way I get through life being suicidal much of the time (I have tried more than a dozen mood stabilizing and anti-depressant medications that did not work for various reasons; it turns out my body does not produce the enzymes to metabolize many psych meds.) is by sleeping. I completely agree that sleep is vital, so maybe three xanax at the most. Also, seroquel helps me sleep, but the sleep aids like Lunesta are awful for me personally.
I live day to day with decreasing function and am just trying to accept that I cannot help my family member any more than I do. Currently we are in a good situation with court-ordered treatment, but I became very ill with physical illness also and am not recovering. Also, our financial limits are different than the people who can hire respite help or have good insurance for hospitals.
The way I cope is pretty bleak. I wake up unhappy and in pain and try to get through each day as best I can. No matter what happens, even if our lives and our family members' lives turn out completely great, my logical brain tells me we are all going to die. There is no need to hurry it along, except to try to avoid pain, which might change. Things might change for the better.
Also, with the current good treatment, my family member is doing really well. I never could have predicted this would happen and I did not bring it about. The one good thing I did was try to get treatment which created records of the illness for the court to use. I am glad I lived long enough to get along well with my family member again and spend time together. Family is the meaning of my life.