I remember my first ever opiate withdrawals when I was 13. I had been on codeine for around 3 months, large doses because I had broken my leg. Towards the end when i'm walking I without any thought stop taking my meds.
I remember walking out of a medical clinic after having my leg checked out, where i started shaking, getting cold sweats and the rest, turning to my father telling him that I didn't feel so well. I don't remember how i got through those withdrawals but a few months later I was shooting up smack at a house down the room so i guess um yeah hmmm.
Codeine withdrawals aren't fun. Only, if you look back a few pages in this thread i've posted some suggestions to help with withdrawals.
1. showers and baths are godsend. I flooded my bathroom once when the only way i could sleep was passing out in the shower.
2. i find lots of physical activity, walking, and so on helps alot.
3. distract yourself as much as possible. Lying staring at the ceiling does not help.
4. The primary cause of "withdrawals" are a family of chemicals called proinflammatory cytokines that bind to mu, ku and gabba receptors all over our body (amongst others). Large doses of anti-inflammatories, and eating (which i know you don't want to do) will help a lot. See you need to metabolise these chemicals out of your body as quickly as possible. Eating, excerising etc will do this.
lying around, not eating will make withdrawals worse and go longer.
(and this is the primary cause of all withdrawals from all drugs i.e. alcholol, cocaine, speed, etc) just opiates are worse cause they directly activate the part of the body that makes these chemicals cytokines hence why opiate withdrawals are the worst)
5. Lyrica helps some people as does Clonidine. I find Clonidine helps a lot.
6. And you may not have realised this but you can ask your doctor for help. Tell them your in withdrawals and need some help.