Is this a flatline? Tired/No Motivation, but Frequent Urges

That could be PAWS (Post Acute Withdrawal Symptoms). But it's hard to say.

 

the question you must ask yourself is are these real urges? Are you horny and is it high libido or does something in you just "feel the need"?
There's a thing called "arousal" its not just sexual arousal, its a thing in general. It has to do with how "stimulated" you are.
A low arousal is also associated with feelings of fatigue/sleepiness/laziness etc.
Your urges probably aren't of the I want sex kind but more of the looking for stimulation kind and that's what P does, stimulate.
Try to see it as more of a "feeling a bit uneasy and under stimulated".
Because your brain is used to high stimulation it has to desensitize so normal things get your arousal back to normal.
Because you're in the process of that you're currently at a low arousal. Because your body wants to hit the optimal arousal it will try to make you do activities that bring it there.
And what's a great source readily available to stimulate you according to your brain? That's right: Pornography.

Here's a picture to help you understand:
This is shown in relation to performance but it has a strong correlation with motivation. "not really bothered" to do something is low arousal, which means you probably have low motivation. This means you'll perform worse because you simply don't care as much. UNLESS it brings ups your arousal/stress. Example; people who have chronic low arousal usually become thrillseekers -> they seek stress/arousal.