Hei Pan,
No I had not read this post before, but I have now. I am so sorry about what happened to you, so much trauma and so much pain in such rapid succession and the isolation and loneliness that you have suffered since then!
I do not even know how to properly express how sorry I am, words seem to not be good enough to convey my sadness reading what happened to you and what situation you are in now.
It sounds like you are not a violent person, your agony over this incident and the fever in combination with sleepwalking sounds like you are not to blame. In addition to the shame and the feeling of guilt due to the assault on the nurse, you have lost your wife and you weren't even able to be by her side during her passing. This must be heart wrenching!
I understand that you are afraid of the judgement of the neighbors and that you have withdrawn into the safety of your own home. I am currently also at home, on medical leave, my 4th week now of 6. I am so lonely, I am so alone. I have lost my family, not due to death, but due to not being deemed worthy enough to be with them anymore. The loss of my family and the crushing isolation that has followed is the reason why I want to ctb. But I don't know if there is still hope for me to turn around, or not.. While I do want to end it every day, I also fight it every day because the tiny amount of hope that still lives in my chest is very hard to kill (I want to give a quick shoutout to @Stan here, whose view on my situation has preserved my life until now).
You have reached out here on the forum, if you want to ctb, you will find a lot of useful information to ensure a quick and painless death. However, we have a lot of really nice and kind people here that you can talk to while researching. You are not alone anymore, and however you decide, you will find people here to listen and to help. My method is SN, as such I cannot help you with your method, but if I can listen to you, feel free to reach out via PM or chat.
I want to once again express my sympathies to you, your situation sounds awful and I truly feel for you. I know it is hard, but you deserve kindness, including from yourself. Whether you journey towards death or towards recovery, be kind to yourself.