It is first important to make sure that your therapist is trained in EMDR from an EMDRIA approved program.
I wrote the book EMDR (BasicBooks) to give an overview of EMDR treatment. This should give you an idea if your therapy is on track. While most diagnoses take considerably less than five years, there are certainly individual differences in the way it is used by clincians based upon client needs.
If you have any other questions about your specific case you can email me directly through the EMDR Institute (inst@emdr.com)