[Kizzy]

With an addiction nobody can tell you what to do an it has any effect anyway, you have to tell yourself....
At the risk of sounding totally nuts I spent weeks 'having a word with myself' about it, and reasoning with my subconscious that this was a good idea for both of us.
(I did say it would sound nuts!)
You could switch the PC off now but I wouldn't as aware as you are that it's impacting on your quality of life I would do a bit of preparation first.