That stuff is genuinely addictive. I'm about 1 week in from it. I got addicted from taking co-codimol during tooth ache. I got sick after I had it extracted and continued to take it. If I didn't take it I would vomit and feel terrible anxiety. It helped me sleep. It helped me relax.
I started buying large quantities over the counter and extracting the codine using a method I won't mention. It's well known. I didn't want the paracetomol, just the codine and the 8mg/500mg co-codimol they sell over the counter can't be taken in large quantities due to paracetamol overdose. I was pouring 100mg codine into a drink and sipping it.
This is actually done recreationally and in the USA it's called "lean". Except they use codine based cough syrups. Only recently learned this.
Codine is pure evil. I read horror stories of people going from pain medication addiction to heroin. No thanks lol.