I had DP/DR in 2015 for about a year. The physical symptoms have gone, but whilst I had it I got the existential questions too and I feel like I'll never feel certain the world around me is real, and because of that it makes me feel like everything I do is pointless, cause it's not real.
Basically, how do I start believing the world is real again, and how can I make myself believe these thoughts are ridiculous?