^ I used benzos on and off for years around age 18 - 22... This period with the libido issue came directly after maybe eight months of daily use. I started to notice it even before quitting the benzos but didn't think much of it as I knew benzos impacted my sex drive. This was in fact one of the prime reasons I quit in under a year, as I still had quite a bit of anxiety, with the other main reason being the mental fog/ negative effects on the brain that comes with regular benzo use. The period directly after quitting benzos was a pretty strange part of my life... During this period is when I noticed that I was not totally back to normal concerning my libido, nor was my state of mind positive at all. This went on some time, it is hard to quantify looking back but I'd put somewhere in the range of a few months. Gradually things started to look up, both in sex life and life in general, and all at once it seemed that I was coming out of this stage.
I didn't realize fully at the time how much benzos were responsible, but I had another brief stint with benzos for maybe a month a year or so after the events above. I was quickly able to pinpoint the similarities to the way I began to feel in the months following the previous benzo addiction. I quickly stopped benzos again and vowed to never use them with any regularity again, which I have successfully done. In the time off of benzos, I've gotten my mental and physical (and sexual!) health into the best shape of my life and am really disgusted by how much of an impact these drugs had on my life. It is clear to me now that much of the negativity in my life during that period was a direct result of benzos, ironically, as I was taking them to deal with the very issues they were causing.
Honestly, I am experiencing the exact same libido problem and overall mental state that you describe. I can physically get aroused but its almost like I cant think sexually. When I used to see attractive women, I would get nuts etc.. and want to...... Now I just dont get that. I am hoping my problem goes away as yours did. Also, if anyone else has gone through this too after taking these types of meds, please feel free to share.