I am lucky that I have never come to the point of full blown benzo withdrawl during these years however I've come close many times.
The closest thing I can compare benzo w/d to is if you've ever taken an anti histamine or certain related plants (datura, belladona) and experienced what delierium is like you've got a small idea.
It started for me with insomnia and thus feeling depleated from staying up even though I was eating right and drinking a bit of tea/coffee to have my mind clear as it was foggy; was 3 days no sleep, and last dose being a day before at only 0.25mg alprazolam. I only had to wait 1 more day - 2 days the latest between refills. I had alcohol around to drink in order to mellow out, as well as excellent hasish and marijuana which were only making the confusion worse I only had 1 drink and 1 or 2 hits at the most so it wasn't much help or effect.
I decided to wait it out, i didnt drink nor smoke because it was hard for me to even think. Let me try to describe it, visually i felt like my eyes were hurting keeping them awake and shutting them was not gonna work (too much insomnia) and my thoughts were incredibly scrambled though i was convinced I knew what I was talking about. For instance, I needed to call a couple of friends or someone whom numbers I knew by heart and must have dialed about 5 times to find who I was looking for, mostly I never found who I was looking for and gave up not thinking anything about it or associating it with my lack of benzos, when I did find by miracle maybe say 1 out of 4 people i was trying to call, i couldn't express what I was thinking. It wasnt a matter of language I was able to talk native and english but it was very hard for me to carry out a conversation with anyone, whoever I was talking to if they didnt know said I was tripping..what did I take to that effect. During these phone calls I took a minute of reality to see what was happening as if wakened a little bit/shook up, when I sat back on my couch I realized that my thoughts were what is called delerium or at least the start of.
Delerium at this point was in that the things/actions I was doing were completley of someone fucked out of his mind yet I didnt think nothing of it and perceived my actions not only as the right things to do but the only things to do. I would try to shake myself out of it saying its the drug but I couldn't make sense with myself though Id have periods/minutes of slight lucidity mix in and come back to reality saying shit I should do something about this at least call someone and then i'd go back to being wack where i would sit in one spot watch either an episode on tv or a movie and try my hardest to pay attention to it but after only 1 min at most Id forget everything completley and not even be shocked, i would just sit like an idiot and repeat the same thing until what kind of brings you to reality and makes you say "i think i should have a benzo" is the shaking which became at this point unignorrable and Ive never had that from alcohol or anything so it was hard to ignore believe me. My hands were not yet shaking unconrolably as in couldn't hold a glass to my lips but they were shaky enough not to be able to light a pipe also the most shaky part was not hand/feet, etc but was this feeling i had in my inner self basically right in the center of the chest going up and down my throath to my stomach I felt like I was about to collapse due to such an intense agitation and tension litterraly choking me as in when I would speak during this period my words were tremmoring/shaking I would stutter the words like from being in the freezing cold a long time. As I realized how fucked the situation was in terms of being close to DTs and possibly a seizure I still couldn't think straight, I felt that sitting there and doing what I was doing (nothing) would be the best thing as I wasn't even able to think of the correct numbers to call anybody.
I finally called or he called me, a buddy whom I begged to give me one of his last xanax bars, being a good friend he hooked me up and after I took 1mg xanax it was incredible, everything was right I could add numbers I could count I could think correctly I could watch a movie or tv show and be able to comprehand it and remember it after it was done. It was crazy to think how close I come to going into a seizure....without even being able to comprehand what was happening due to delerium.
p.s. needles to say it was a scary experience, opioid withdrawl (at its most severe) is like a very horrible flue but nothing like benzo withdrawl