You have already started the downward spiral. Heroin isn't the problem, the disease found other ways to play with your head, heroin is the comfortable spot and the end result to get your fix. The only way I have been able to stop that downward spiral is total abstinance.
If we think we can handle just one more, we are doomed to keep using.
Have you tried going to Narcotics Anonymous meetings?
Do you really want to stop using?
It doesn't matter what we use, if we use, all bets are of with finding a New way of life.
Peace,
Todd J.