I am in the same boat, I am so lonely, I cannot cope anymore. I've lost my partner, his children, his mom, in short, my whole family. In addition my best and only friend has told me that I'm too negative and she needs to protect herself and cannot be my friend anymore. I am all alone in my apartment, no one calls or messages to check on how I am. This forum is my only human contact, my only lifeline.
I think I need to work on myself a bit more to CtB. I desperately want to do it, now. But I still have a minute ounce of hope that I might be allowed back home. Once this hope has vanished, I think I can easily go. Dealing with death can help, as @charlie_z has recommended. I've been into Buddhism for a long time and meditation and contemplation allow me to prepare myself and accept my death as inevitable. To overcome my SI I've also decided to chose a peaceful method, as violent methods have a higher risk of triggering SI. To make it even easier, I will fill my SN in capsules, as I am already used to take 2 pills before going to bed. So on the day I CtB I just take a few more. I hope that will make it as easy on me as possible.
I wish you all the best, whatever you do, be gentle with yourself along the way.