I haven't had it done on me, but I've heard other people say that it helped them a lot.

EMDR is specifically designed to help people resolve their trauma smoothly, without a crises/mental breakdown. As I said, for some people it is a very effective method of trauma work. However, it works only when the therapist really knows what she is doing. A therapist must be certified as EMDR practitioner in order to be allowed to practice it, otherwise they'll be operating outside of their scope of competence.

Ask your therapist if she is a certified EMDR practitioner and where she got her EMDR training from. You want to check that organization's website or call them and make sure she is on the list of their registered practitioners. Without checking her credentials first I wouldn't recommend doing it. Also, if I remember correctly, there are different levels of practitioners, from beginner to advanced. You may want to check all EMDR related info on EMDR institute website. It's the most credible EMDR training place I know of so far. Definitely, inform yourself first before moving forward with this.