I must agree with maus, in that EMDR is contraversial, it is radical by some means, though it does and is helping a lot of people. Yes, it is doing a lot more damage, though that is not necessarily the technique itself, but more the person delivering the technique. EMDR simply "IS NOT" for those with multiple trauma or life long trauma, clear as that, and the originators of EMDR make no mistake about that. It does help a lot of people with one or two traumas only, but is not for someone who has possibly hundreds and or thousands of constant traumas within their life.
If you fit the "IS NOT" criteria, then you should not consider EMDR, regardless what your therapist or EMDR specialist says, or is trying to prove; yet you should seek more along the lines of CBT for prolonged trauma, as its not as invasive nor does it have the consequences EMDR can and does have, ie. releasing too much trauma to cause brain damage. CBT doesn't cause brain damage because the person brain is limited and controlled by them, thus the most that can come out is only that to push towards suicide, yet not brain damage. All therapies have risks, and some might say "suicide", and get worried, but suicide is still a choice, brain damage through EMDR is not, that is the difference. One the person controls, the other they do not.
EMDR specialists are trying to push the boundaries beyond what its capabilities are, trying to make bring it to the same level as say CBT is used, yet it will never be nor should be compared to another therapy, as each therapy has its unique usefulness. CBT and exposure therapy is the primary one used for PTSD because it has the proven long term effects needed for a sufferer to arm themselves with the required skills to manage PTSD themselves and manage their lifestyle. EMDR is a bandaid type therapy that often does not have the long term benefits CBT does when your talking multiple trauma.