Suboxone can be just as bad as a dependency as most any other opioid... Horrible recommendation for codeine withdrawals.
That said they're only 5 days where the 3-4 day is the worst. Your doctor should've provided a "kick pack" with things like benadryl, zofran, clonidine, etc meant to reduce the severity of withdrawal symptoms.
Not much to do besides tough it out
Edit: Make sure to shower regularly, eat proper nutrition more then filling, and wear clean clothes... The little things will make all the difference