Hi Kate,
I can see that your son’s addiction is really hard for you and it’s difficult to know what to do for the best.
I work for a charity called Icarus Trust which you may find helpful to contact. We offer support for people dealing with the impact of a family member’s addiction, like yourself, because we know it’s so hard.
Please get in touch if you think that talking with one of our trained and experienced people would be helpful to you.
You can contact Icarus Trust on help@icarustrust.org or visit our website http://www.icarustrust.org
All the best.