Cocodomol 30/500 withdrawels

I hope you can help me?
I have been prescribed Cocodomol 30/500 for a good few years now for Artheritis
i decided enough was enough and decided to come of them myself as i was getting dependent on them
i have took this action several times but always went back on them because of the side affects of comming of them
I always take a cold and a caugh get really nausiated i feel like someone had kicked lumps out of me as i am that sore
all over i get sweats and feel really iritable but i am determined not to take them again.
This was the reason i started taken them again because of the caugh as i cant sleep at night.
I also suffer from asthma and i feel really wheazy i have taken my inhaler.
how long will this bad cold like symptems last? it has been a week since i took
the painkillers.. i wil just keep the pain as the side affects from these are worse.

please help x :(