We cannot suggest methods here, only give plain information really. I would say ODs are generally unreliable especially with modern meds. It's honestly just as effective as slitting your wrists, or possibly even less so, which has a ~2% chance of success on average. I would also say that looking for a painless method will only leave you with disappointment, as governments worldwide have done a great job at eliminating access to things like Barbiturates, and guns are really only accessible in red states within the US. So CTB is likely going to come with some level of discomfort or pain, unfortunately.
I'm not familiar with panadol, so perhaps someone who knows about it can chime in. But I'd advise against it. EDIT: looked it up and saw that it's tylenol or paracetamol.
Absolutely do not do this unless you're willing to suffer greatly for days or even months. This will only cause liver failure, which is an agonizing and slow death. Mixing it with other pills will not help at all.
Have you tried checking out the Suicide Resource Compilation?
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