OK, first thing is you need to tell us what kind of doctors are seeing you, and where. You want to be sure that the opinions that you are getting are from the best people possible, since YOU will be making decisions based on them, not the doctors.

Now some good things to keep you calm while you continue to explore this. Lichen Planus is not definitively a precancerous condition. While dysplasia is a bit of concern, it has not been defined as high grade. That is good. Here's a statistic that you can think about while you move forward - only 20-25% of all dysplasias in the mouth move on to become malignant, treated or not. Smoking is I hope, something that you have stopped. No sense in aggravating the situation and contributing to the problem.

As to Clonazapam /Klonopin, if you are having problems in controlling your anxiety while you sort this all out, there is no shame in some pharmaceutical help.

So now tell us about your docs and where you are, and what kinds of tests people are talking about, or what they wish to do next. It may be that given this diagnosis by really good doctors that watching things may be OK for awhile. Lichen Planus has nothing that you can do about it, except treat the symptoms, but no drugs etc. exist that can get rid of it.