First EMDR session, feeling conflicted?

I have had years of therapy, CBT and DBT based primarily for childhood trauma. I recently just experienced assisting someone in a serious car accident and have been feeling stuck with the images from the scene. My session started with talking about the accident. She then had me close my eyes and be in tune with my body. I began deep breathing and focusing on loosening my muscles and relaxing. She then had me do the butterfly taps and had me focus on that safe place and to discuss what I was feeling. She ended each round with having me breathe in deeply and exhaling. When I felt anxious or felt I was seeing those images she asked me to continue focusing on my safe place and breathing. By the last round the images are faint and more vividly replaced by my safe place. After session, I felt so light and exhausted. I felt a tingling sensation along my hands/fingers. My session happened yesterday and no matter how much I try to visualize the accident now, I see predominately my safe place. Is this EMDR? Was it done correctly? I find the whole thing so strange and was filled with so much doubt initially when I started doing the taps. I felt so vulnerable and that there was no hope of it working, but really wanted to believe in it as I have so much childhood trauma to try to heal.