Holy shit, I had very similar symptoms to this for the first stretch of my proper recovery too. I also experience them in a milder form for a couple of weeks after a relapse, but my relapses are generally so spaced apart nowadays that they get milder every time. I genuinely thought it was just pure chance and nothing to do with my addiction but these symptoms are almost exactly consistent with what I experienced (minus the fever). It was like a cold that never went away, at least not for a good half year. I always assumed that, since there's no chemical side of pornography (ie you aren't injecting anything into yourself), there would be no physical withdrawal from porn; and while flu-like symptoms are definitely nothing like benzo or opioid withdrawal, I guess physical porn withdrawal is more real than I presumed. PAWS (Post-Acute withdrawal, mental withdrawal) from porn is 100% real though, and can last years. I'm still battling with it to an extent now.