EMDR/Brainspotting

I have gone through brainspotting (very similar to EMDR). I have ADHD and I question if my experience is similar to others. As I went through brain spotting and was trying to focus on reprocessing traumatic events in the past, I noticed my attention waning. Almost in a throbbing way. It would come and go, increasing and decreasing. I really had to muster up effort to concentrate. My therapist said this was normal. I want to know if it really is normal or if this is an indication of how my ADHD brain functions. Anyone else want to share their experiences of EMDR or brainspotting?