^^That's a good way to put it, I have always used the term difficult experience. I have learned a great deal about myself and the world/universe during some of my most difficult experiences.
Anyway, yes benzo's will help to some degree, in that they will basically sedate you to the point of sleep or at least close to it. If you ever want to abort a trip, take a little more than you normally would to go to sleep or become inebriated and you should drift off. Make sure you have a trip-sitter or someone sober/trustworthy to administer the dose, as it is easy to make mistakes whilst tripping, especially in the midst of a difficult experience.
On a side-note, I find taking a small dose of xanax(2-4mg for me) along with LSD to smooth out the whole experience and let me concentrate on addressing personal issues. It is especially useful for high-dose experiences as the body-load can be quite distracting on a high dose of any psychedelic.
Cheers and be safe!