Hi Skylark,
I have BPD for many years, and have been through a range of treatments and councilling process's to try and get on top of things including EMDR.
I have had EMDR 3 times now for specific "named". trauma's that induce high levels of anxiety and emotional disregulation and have found this to profoundly break the link between the trauma / ptsd event and the emotional response in 2 of the 3 times.
It is definitely worth a try, but you need to be ready and in a space of trust to get the most out of the sessions. Key is to focus in on a specific event or issue, the ability to have complete trust in the facilitator / therapist, and the ability to belief that you can survive your panic response in the safety of your therapist/facilitated session as you enter into the EMDR sessions.
EMDR is very intense as its a form of hypnosis, so you need to relax (in your panic state) and let the facilitator guide and support you through the trauma response. I have found in all experiences, that there is a moment in the process where you want to break out of the process (eg you start telling yourself, its to hard, I'm to scared, I don't trust the therapist, this is crap etc....). These are the pivotal moments, to relax (as best you can ) into the process, continue and let yourself be guided by your faciliator, the more you are able to ready yourself for this, and be able to trust the moment and the process the greater the benefit.
To me its like sensing the fire of fear/panic and walking forward anyway..
where I have been able to do this fully (2 out of the 3 times) the link between the trauma and the anxiety has been resolved and fixed within the session.
I would definitely consider it, it will not cure everything, but when it does work, for that issue/trigger, it can be a profound and lifelong resolution.
I hope this helps, and good luck.. its definately worth a shot if you trust your therapist and they are recommending it for a specific issue.
cheers. Bob2