I experienced this numbness, followed by a high and a two day episode of psychosis with my paranoia heightened. The end result though was that I remembered my sexual abuse as a child in an orderly sequence instead of an array of disjointed memories.
I spent the past 2 weeks in Hawaii. Much of my life is about experimenting with new ways to better my mental health since I have the time and money.
On this trip I discovered that after looking at Hawaiian sunsets 5 days in a row you can experience a numbness/high that alters your memories.