The heavy head is one of the symptoms after I watched porn and I'm sure it's not self fulfilling prophecy, it's like brain fog. When it appears, I feel more stupid, my thought becomes disorganized and I'm less aware of surroundings. Beside that, the reason why I excessively turn my head round is that to check whether I have the feeling of something teared up inside at the back of my head ( it's not synapses pardon me but I don't know what it is), that feeling of something teared up also happens when I move, pull my jaws and open my mouth widely. Another physical symptom is tics whenever I finish a sentence or even short words, I looked it up and found an idea say that quite similar to tourettes syndrome and has something to do with basil Anglia in the brain. What I found fascinating is that in the sub r/nofap, lots of people have positive feedback about their stutter after abstain themselves from porn, fapping ( speak more fluently, less speech blocks) and I myself is live example. So I wonder maybe high dopamine plays a vital role in why we stutters? Have you resorted to no PMO ( porn-masturbation- orgasm) as a solution?