Welcome Owl! Day 9 is amazing! I would say a few more days yet. That feeling of doom is horrendous isnt it?? But it will go. Anxiety for me lasted about 3 weeks. By day 21 I was loads better. Lack of motivation is par for the course I think, again that will pass. Rest when you can and realise you never ever have to go through this again. If you can, eat a little, it will help even if its soup or just a little something with some nourishment. Definitely drink plenty of water. I promise you the sadness will go. The codeine affects the reward centre in your brain, ie it gives you the reward without you having to do anything to get it so the natural endorphins (pleasure hormones) go to sleep. They do wake up again ????.
I too spent my whole time chemist hopping for a meagre high! Pointless
Stay in touch and know you can do this!