When I am miserable, I have no problem trying a new med, but I can see where it may be scary for you if you have had some bad reactions to some of them. No one likes taking them, but if it is needed to give you some quality in your life, dont worry about being scripted what you need.
I used to be scared of becoming addicited to a med, especially since I had the hope that one day I would no longer need them, if my healing progressed to that point. Now I realize that Chronic Pain will be a part of my life from here on out, so I dont worry about it as much.
I don't know why, but I have never really suffered, what most people decribe as a withdrawl, when I have taken myself off for a while. (7 days at the most). All I suffered was the return of my pain to the max.
If it is something you need, ...sooner or later I would think your going to have to try them. What did your Dr say in reguards to taking it? Also I'm a thinking that a breakthrough med is just what it says it is, and should be taken when needed. If you don't think you need it, then dont take it.
It would be nice to know though if it will work and not leave you with a bad reaction, just in case you do need to take it.
I don't know that I helped you here, but maybe someone will have a better suggestion for you.