Benzodiazapine and related drugs such as klonopin and diazepam do have a high potential for abuse and addiction, mainly because one develops a tolerance to them which leads them to take more, and because they develop a physical dependence, ie. completely unable to sleep without them. The other drugs you mentioned for sleep:

Ambien, a very similar chemical to benzodiazapine with the same potential for abuse
Trazodone, an antidepressant sometimes prescribed off-lable for insomnia with withdrawal symptoms common
Lunesta, a non-benzodiazepine that has all the pitfalls of a benzodiazepine

These drugs would probably not be any better for you.

The other drug that was mentioned, Seroquel, does have a wonderfully sedative effect, and I have only had chance to use it once. I slept for six hours without waking up once, which for me is a record. It is sometimes prescribed off-lable for insomnia, but because it is a second-generation antipsychotic and very similar to Olanzapine, it has a high propensity for causing weight gain. I gained 30Lbs on Olanzapine, and had it not been for the somewhat emergency situtation I might have refused the Seroquel because of that fact. This does not happen to everyone, but it is one of the most common side effects of atypicals, and everyone I have spoken to personally about them has been really uncomfortable with the amount of weight they gained on those drugs. It is also somewhat dependent on the dose, and because someone might be using it strictly for insomnia and not as an antipsychotic, a low dose may effectively be used without causing the same degree of side effects as experienced by a schizophrenic or bipolar patient, so it may be worth discussing with your doctor. If you have a naturally addictive personality, be warned that Seroquel also has potential for abuse, but probably not to the point or for the same reasons as benzodiazepines.

My recent experiences with the benzodiazepine family have left me very wary of their use, for any reason. Although low doses may be effective for controlling short-term anxiety, their long-term use for sleep is not recommended because of the tolerance and subsequent abuse potential, as well as the health problems associated with long-term use or sudden withdrawal, which can be very dangerous.

I was prescribed zopiclone, the same non-benzodiazepine found in Lunesta, so I can tell you that I understand what you are going through. It stopped working, so I took more until it stopped working again and then I took more... and then I realized there would never be enough and if I kept going that route I would overdose. I realized how pointless long-term use of this drug was, and decided to stop taking it. And then I didn't sleep at all, for days. I would lie in bed and be in this half dream state, hearing constant sounds in my head, unable to break the threshold of unconsciousness. I lay in bed for 12 hours the first night, exhausted and unable to sleep a wink. The second night I slept for about ten minutes, taken in momentary snatches as I lay in bed for 8 hours. The next night, knowing I wouldn't be able to sleep after five hours, I just got up and went about my day. It is slowly improving, day by day, but even when I do fall asleep I soon wake up, turn over, and try again. No matter how much I lie in bed, I'm not really sleeping. I, too, need to talk to my doctor about what the next option will be.

I really wish you strength and luck dealing with this. If you really want to stop taking them, don't do it without talking to your doctor first; you could end up like me or much worse.