I recently withdrew from suboxone(buprenorphine/naloxone), which was horrific with severe agitation and anxiety, particularly at nighttime. My memory was heightened during the withdrawal, however while i was taking it I was impulsive and emotional causing severe work issues, but all I remember was feeling "foggy" at times when my senses were dulled. Memory may have been an issue but there was so much else with my health going on, like newly diagnosed diabetes last August and that had an impact on my physical/emotional well being. I had also started on pericyazine for the bipolar related anxiety(typical antipsychotic) It became like peeling back the layers of an onion to try and disseminate what was causing what.
Not sure I've been of much help, but that was my experience