EMDR typically isn't something you'll "feel" or even recognize that it is doing anything. The purpose of EMDR is to help the brain to access and release memories that are "stuck" for lack of a better term. Think of a ketchup bottle. When the ketchup doesn't come out, you turn the bottle over and bang the bottom until it starts flowing. EMDR is a similar process. By constantly stimulating the left and right halves of the brain, we encourage "stuck" experiences to become unstuck, and allow them to be processed normally. (Note, this is my personal understanding, I am in no way a mental health professional).
Not all IC's are trained in EMDR, and not all that are trained are trained properly. (Funny thing, we used to live across the street from a woman who was a therapist, and who ultimately ended up on the board of EMDRIA, so EMDR was her specialty and she was recognized in the field as an expert on the subject. She's the one who introduced me to EMDR in the first place. You can use the EMDRIA website to find qualified EMDR therapists in your area). It's a little weird that your therapist used buzzers AND a light. It's usually just one thing or the other. If one technique doesn't work, you try another. Buzzers, tapping on knees or wrists, using a light or other object back and forth in front of the patient's eyes are the most common techniques.
Just want to clarify something: is the goal of talking through the raw emotions so that your brain can understand where the pain is coming from? So if you focus on the reasons why it hurts so much then eventually it will hurt less?
Yup, that's part of it. Another part of it is to allow you to make new connections and bring new meaning or reactions to those thoughts. So for example, as a WS, I found myself trapped in shame for a LONG time. I kept blaming myself and my actions for those feelings, however after a while, I started to realize that many things in life brought me inordinate amounts of shame. Any infraction, no matter how small (e.g. I forgot to pick up milk on the way home, I mixed up what time a TV aired) sent me into deep shame. In order to better understand that, we used EMDR to go back and try and remember my first feelings of shame. I won't go into all the details, but suffice to say that I remembered that something had happened to me (I wet my pants in front of classmates) which embarrassed me. My mother and the teacher, instead of protecting me and letting me know these things happen and to bolster my confidence, instead chose to laugh and make fun of me in front of my class. So I never learned how to deal with shame in a healthy way. Understanding this helped me in two ways. One, I realized that what happened wasn't my fault, and that I had nothing to be ashamed of. Second, I realized that the actions of my mother and teacher were wrong, and that I was taught an unhealthy and self-damaging way of dealing with the shame. With that info in hand, I was then able to start purposefully choosing new ways in my life to deal with shame. I could replace unhealthy messages and reactions with new, healthier ones. I could start to value myself where I had no value before. I was able to hear my wife's criticism's of me without melting into shame, and in doing so, I was then able to have empathy for her, and see her pain rather than my own. It was one of the first major dominoes to fall for me.
I'm not sure how to advise you other than to try another method or EMDR or another therapist, and, realize that EMDR isn't going to "do anything for you", it simply provides you with another avenue towards accessing memories and experiences that you might struggle with accessing. But once those are exposed, it is still up to you to decide what to do with that info.