Your story has some similarities to mine Oobs re the obsessive compulsive actions. Its great that your main obsessions (work and exercise) give you that buzz to replace the opiate use. Like you, I took heroin many years ago but stopped it due to the realisation of certain death if the habit carried on. I then went back to amphetamines and alcohol before finally settling on codeine which has been with me for so many years.
I really want this to be my final time of going through this. I am 60 next year and do not want my later years blighted by this dreadful all consuming habit.
Thanks for sharing your story. I find it fascinating to hear our different experiences that all lead us to the same place in the end.