A harsh detox could cause a problem yes. A long slow taper should not be harsh. Its when people go cold turkey or lower the dose too fast too soon that they get the bad reactions like seizures. You can treat that while doing the right thing for me/cfs at the same time. Do not push yourself into activities if you can avoid it.
Are they proposing to give you phenobarbitol instead of a benzo? If that stops the wd's then you could taper quickly without too much stress.