Just thinking out loud mate, but what you`ve said made me think of Duff Mc Kagan, who was the drummer for Guns and Roses.
He was doing either ten bottles of wine or four pints of vodka a day and coke and he was apparently days from death, before going into rehab ( again ).
When he was in rehab he got into mountain biking as release ( the place was in the wilds ) and carried on when he got out and ended up remaining sober and becoming an accomplished hard core mountain biker.
I`m just thinking that due to the fact that you live in rural Spain, there must be a lot of outdoor stuff to do - cycling, walking, climbing, running etc.
Could something " outdoorsy " not be a release for you too.
I know that Mc Kagan states that he now gets his " high " from mountain biking and doesn`t need drugs / drink anymore.
As I keen trail runner and a long time sufferer with anxiety related problems, I completely agree with what he says.