I don't know what's happening to me. Please help.

I've been addicted to pornography since I was 11 years old, I'm 24 now. I decided to quit for two reasons, the first one being my girlfriend of 3 years and the second one is the fact that depending on porn for my daily dopamine made me a lot less productive in my freelance job. I live in a more conservative society so having sex with my girlfriend is not easy to manage, although we do when the circumstances make it possible. However to make up for that we usually share nudes and we sext, so I'm not complaining about my sex life regarding this aspect or trying to find excuse for my addiction. But I've noticed that because of my dependence on porn, her nudes are only effective a couple of times then I'm bored with them and want something new. However I never overtly demand pictures because I hate any kind of pressure in that regard and I like the fact that she loves sharing them on her own, plus the fact that asking her to send me fresh pictures every day is just insane and I respect her enough to reject this idea.
But my situation now is a little hard for me to understand. I've blocked every possible access to porn irreversibly, I can never access porn no matter how hard I try. It's been only three days and I'm feeling a level of sexual frustration I didn't know existed. However whenever I try to depend on past nudes or on my imagination to masturbate It takes me so long to get aroused, sometimes long enough for me to feel fatigue and just give up altogether. what is this? I'm so horny to the point where i'm on edge all the time yet I can't get aroused and can't get off, and whenever I actually succeed it's just a very weird experience were I go from no arousal at all to a very weird forced orgasm that isn't as satiating as porn which leaves me even more frustrated.
Am I deluded into thinking I'm horny when I'm really not? has my porn addiction transcended sexual urges and become it's own thing? someone please help and explain.

 

I don't consider her nudes porn though, she's literally my significant other.

 

This makes perfect sense. I'll put that in my mind when I'm feeling "horny"

 

I'm Middle Eastern, people here are so uptight about virginity and premarital sex..my girlfriend (now fiancée) and I are not, though. But we have to keep putting up an image. So we only have sex when we're all alone in a private place which rarely ever happens.
If people knew we have sex it would actually be a problem lmao, and I fear for her safety.