I can't put it any better way: The psychological anxiety common of persons with anxiety disorders, depression, OCD, withdrawls, is the source of any physical symptoms experienced concurrently with the former. Ex.: the more mental anxiety one faces, the more likely physical symptoms are to manifest themselves in a similar way. (Remember the old saying about "mind over matter"

), well it turns out, in my own expierence, mental stress/anxiety/depression does influence the physical state of the individual.
I remember in middle school I began to stutter, which developed roughly the same time in my life when I started experiencing more difficult emotional stress (like many middle-schoolers), but also facing the realities of growing up, and my stutter persisted but gradually declined as I became accostumed to the stress, embarrassment, etc. of having a stutter. it was many factors, too many to name, which led my physical condition to start reflecting my mental problems. As soon as I began letting go of those anxieties, the impediement of language had been lifted.
I have other personal examples to show this but, point being, it is often true that the mind and body are linked not by chance but by necessity, whether that be pain or pleasure. If there is stress to be had, it serves a purpose similar to a warning sign (Hey! Youre in rought shit - and while you toss and turn fighting insomnia, remember that you now have two enemies to face. One: obstructing you from rest The Other: causing worry about getting adequate amount of sleep.)
Thats how I make sense of it. but please offer a rebutal if Ive completely missed the point. I type very fast when I have no anxieties at mind (heh I have to poke fun at myself occassionally). Clonazepam has proved a wonderful anxiolytic for me, I would recommend it to those who enjoy stability, it's not a drug to get a "rush" from compared to Alprazolam, which for me, is too potent to actually improve those waking hours.
Ciao