I've read an answer here before about this. But in context, it looks really, really bad...
You can do partial and make it look like you were going for autoerotic asphyxiation(jerking off). I've literally read a few members saying this. It's a very clever idea. I'm not joking about this. As inappropriate as it seems, it truly would be a cover up. People have died this way.
Another option is to leave your phone open on some Wikipedia page regarding "The Choking Game" . If they see that, they may think you were doing it to get high, but you accidentally passed out. Depending on your situation, this may be convincing enough.
You should consider if it's truly best that it looks like an accident. Sometimes the truth is best, especially if people are suspicious of you. It could cause them to wonder if it was actually intentional for the rest of their lives.
I truly am sorry that you're suffering so much. I hope you've exhausted your options. If not, please consider talking to someone, whether it be a friend, family member, or therapist. Additionally, please don't rush into anything. You want to be sure it's what you want before you attempt anything, especially hanging. You don't want to be found early either in the case of hanging, as you risk serious brain damage.
I wish you the best. Remember that you can always talk to us on here.