Hi NS,
It may take a few more days for things to ease, but it will so hang on in there. It’s just your brain freaking out as it’s not getting the dopamine from the codeine.
From what I read on here it seemed most people were feeling a lot better by day 7/8 but for me it took longer, it took about 3/4 weeks before my anxiety settled. But I kept going as I wanted a healthier future and I kept saying that to myself.
Hopefully it won’t take as long for you as you weren’t taking as much as me.
Day 4 is tough, I remember on day 4 and 5 I felt like I was losing my mind. I just didn’t know what to do with myself. I even debating taking tablets and trying the taper method.
Keep going it will ease before you know it, try to stay hydrated and keep telling yourself it’s all normal albeit unpleasant.