I think that most people here, including myself, either while tapering or in recovery get these horrible bouts of hopeless despair. The good news is that this is very common to benzo w/d and recovery, and is temporary. It seems to just be part of the complicated symptoms associated with benzos. For many it comes and goes, until eventually, once healed, our emotions level out.
If however, you ever find yourself in a situation where the despair and depression is lasting unabated for many weeks, and you start becoming suicidal, then professional intervention and possibly even an antidepressant may be needed. Most cases, however, seem to resolve. For some here, the crying actually provides a much needed emotional release.
I hope you feel better soon. I understand how very unpleasant it is to feel like this.
Take special care.