Hey Mendy, good to see you're on the mend.
I have/had the same issues with MP's. You describe the trigger as a stressful day, but for me it can be the opposite - everything is going great. Then I find myself "restless, irritable and discontent". And suddenly I'm in a dark place, literally and metaphorically, it feels great in the moment, then within 30 seconds, it's like, what the heck just happened, why did I do that. H" now hates me, I'm doomed, chas v'shalom. And the cycle repeats over and over.
Whether you have an addiction or not, only you can say. It may take time, it may take bigger setbacks than you have currently experienced, including but not limited to: alienated and angry kids, spouse; financial problems; community disgrace, etc. Most people have to hit some sort of "bottom" when they come here. And that bottom has been "raised" thanks to GYE work.
Perhaps you can admit that your sexual problem is "maladaptive" in the sense that, most sane people deal with stress more productively. They don't run to MP's. If you have maladaptive sexual practices, the work then becomes how to correct them. The method from this site has been tried, tested and true.
I'm not going to offer specific advice since I am pretty much in your boat and part of me still clings to the forbidden. Even though I have not acted out in a long time, there is a deep part of me that still has not turned everything over to H". I still feel as though if I can't handle something, I always have a place to go, i.e. the chambers of the Sitra Achra. Why I have this belief only H" knows... but it's my job to correct it, if I wanted to achieve my spiritual journey.
Kol tov bahava. I'll PM you my number so you have a number to call.