Why would I go back to porn? That shit rots your entire body, mind, and soul. All these paws symptoms should be enough to never go back to that shit. It no longer aligns with my brain, body, or life. Now when I look at porn, sure there is a nostalgia, a curiosity, a certain level of arousal, but the arousal has reduced 10 fold and my body responds to it with discomfort now. The last time I had a bad, long, compulsive peek, my body was shaking like crazy. That was the most obvious symptom, not arousal, not excitement. That shaking is my nervous system trying to process the adrenaline from the porn in real time. It's very uncomfortable, but is a sign that my body, mind, and nervous system is rejecting the behavior now and has reached a calm baseline. If you do recovery right, you won't want porn anymore eventually.
I don't think anything is ireversible. I cannot know what you or other people on this forum are doing for your recovery but what I can tell you is it requires effort in all areas of your life.