Here's some advice because I did exactly that when I tried to CTB:
Don't do it. OD rarely works. I took lorazepam, lamotrigine, aripiprazol, sertraline and clonazepam. I was planning to hang myself after that but I had taken so many pills (60) that the effect was instant and I passed out. I was found unconscious next day, naked (dunno why), and vomited all around. Then, I ended up in a comma for 2 days and 1 month in hospital.
Now, I'm a prisoner in my parents house who is monitored 24/7. However I've won some freedom back and now I'm allowed to go to my apartment once a week.
Anyway, that's my advice and experience. You are free to decide what's best for you.
Lots of hugs and wish u the best