Hey man, I salute you for your bravery. I'm not one to try to encourage people against or for a certain method, but a lot of times when we suffer with excruciating pain, we often believe that we can handle almost anything, but this isn't true. There's a level of pain that will cause you to seek immediate help. Whatever pain you've gone through, there's a level of pain much worse than that. I'm not trying to dick size here or say that I have expereienced more pain than you, because I likely haven't considering chronic pain isn't my main issue, but all I am saying is that you don't have to take that mix of drugs, you can continue to fight on until you've acquired a more peaceful method. Just a thought. I definitely don't want you to feel like I am telling you how to terminate your consciousness or anything at all really, I just think that everyone here including me would like to see you have a peaceful death like the many others that have posted here and passed on. :)
Nonetheless, I wish it to be a peaceful transition and that the suffering you have endured for so long comes to an end.