Donuel, I was deeply moved by your intensely personal post. Addiction in all it's forms is difficult to treat, relying, as I'm sure you're aware on the individual acknowledging they have a problem & then engaging in a treatment program. I speak from the standpoint of my own addiction to alcohol & latterly, as a psychotherapist, working with addicted adolescents. 'Internet addiction' is a relatively new phenomenon, but just as destructive, nonetheless. In the UK, CBT (cognitive behavioural therapy) is often the first choice from the 'talking therapies' & available on the NHS.
If you were able to get your youngest to see a CBT professional, both he & your Family might find the help & support you so desperately need. Addiction is not confined to the addict alone. Family & Friends also have their own related issues with which to deal. I send you every good wish in your quest for a solution.
                                                    With Love,
                                                                     Nigel.