Hi nomore80,
Welcome to psych central. You have come to a good place, don't worry about 'getting it right', I came with zero experience of anything like this and, with a couple of questions to Community Liaison, I slowly learned to get by, though I keep learning new tricks.
With regard to telling your doctor or therapist, it is completely up to you what you share, but I find that honesty helps them give better care. Maybe disclosing this to your therapist could be a way of taking more responsibility for the SI which would then help if you want to be able to choose to stop.
I'm trying to kick the habit at the moment, and I know that no one can stop me doing it, it's my choice, although I'm certainly not making light of how hard that choice often is!
Best of luck whatever your decision.

