This is not my own abuse of substances, but my son's. Using mainly amphetamines/recreational drugs over a long period (he's now 44), he reached a very low ebb. How I didn't recognise the problem, I'll never understand - maybe I was naive, or perhaps I just didn't want to face it. He admitted he stayed away when he'd been feeling particularly bad, so that could be a reason.
His health improved, through counselling and I thought that was it, and he was going to be OK - give or take a few blips, perhaps. Those blips did happen as did his relationship breakdown (due to bad habits on both sides), and he's been at a bit of a low ebb again. He's dealing with things not too badly, though I'll never get the full extent of how things are with him. He picks up viruses really easily, and says that as he's, in effect, 'drying out', these are the toxins leaving his body (sickness/diahorrea) etc.
I know we can't live their lives for them, but oh, how I wish we sometimes could. Perhaps I need to speak to a counsellor myself. It's in my mind all the time, and although my son says he's dealing with it, through talking it through with his close friend, but I'm so fearful all the time.
Sorry for this long post. I hung back from writing it all down, as I felt I may be letting my son down, by bringing his business to a public forum. However, if speaking to 'you lot' (soop's description!) can help me, it may just help others who are experiencing similar problems.