Unless you've had severe opiate addiction to other opiates/(oids) you shouldn't really suffer that much.. If you've only done heroin 10 times (or 10 benders) and you've now only used for 5 of 8 days, you really shouldn't be going into severe withdrawals.. With prolonged use; yes eventually you start withdrawing after only a day or two's use, despite lengthy breaks, but when you're early on, you should be able to use a LOT more frequently than that without getting into serious w/d territory.
I mean, everyone is different I guess, but I really don't think you should suffer too much. That said - I've always found cough syrup that contains dihydrocodeine really, really helps and is a pretty easy taper. I wouldn't recommend anything stronger than that at this stage (methadone, bupe, etc) else you'll just compound your problems.