Okay, so after i sent the first message my phone died. I went back to sleep (the charcoal was just basically ash by this point) and woke up around 6 hours later, alive and with a headache and some flu-like symptoms. By this point I was pretty sure I wouldn't die so I went out to charge my phone. I then booked two more nights at this campsite. I'm now heading to an outdoor shop I found about an hour away. Hoping to try again tonight with this method. I really really want it to work, I'm determined. If I fail again after trying to fix the problems from last night I will probably have another go at hanging myself the next day, either partial or I'll get another stool and try to muster up the courage for full suspension.
I feel I have two options: buy a cheapish 2-person pop-up tent with a shit hydrostatic head (1200 maybe) and either put it inside the tent I have already or erect it next door. I went for an expensive 3000 hydrostatuc head and 4-person tent based on 8chan advice but the skins turned out to not be properly connected and the tent was definitely larger than needed. Or, try to find something to put on top of the inner layer while standing outside, before putting the outer layer on, that will cover the whole thing and can then be duct taped. Maybe even try bin liners again but from the outside this time. I would have to wait till it was dark to do that though and hope the sound of duct tape didn't cause people to look out of their tents.