Well done on making it to 8 months - that's a considerable achievement and you should be proud of yourself for having shown such determination and willpower. As you can see from the replies, you aren't alone in experiencing ED after a long period of abstinence - there are other people walking this same path with you.
I quit porn in early 2019 and have found that quitting was only one step in my own recovery journey (though a very important step that requires a great deal of courage and strength). Without porn as a crutch I had to face the pain that was stored within my body and mind that had led to, and fuelled, my porn addiction. Though I haven't watched porn in years and no longer have the desire to, I am still recovering from the wounds beneath my addiction, which originate in my abusive and neglectful upbringing.
If this resonates with you, you may want to explore any possible underlying medical or psychological cause of your ED. As you mention sensing a disconnect between your head and groin, you may benefit from some type of gentle, body awareness meditation, conscious exercise e.g. mindful stretching, or body focused treatments such as massage and/or acupuncture. These techniques are known to help reconnect disconnected parts of the body. These are just some ideas you may like to consider based on what I've found helpful and seen to be helpful in my time in healthcare and meditative practice.