It sounds like you really aren't coping with all the stuff that is being brought up and the containment skills you do have are not able to do their job. it would be really good if you are able to share that info with your EMDR at the beginning of your next appointment. It's a sure sign that you need to dial back the reprocessing phase and return to resource building.
Any time the triggered stuff is greater than the ability to contain it its time to go back and work on resourcing again. Stop moving forward with the reprocessing. it sounds like your not ready. Its not supposed to be this hard and it can be changed.