Welcome to the forum!
I also have PTSD from complex trauma. In my case it physical, sexual, and emotional abuse, as well as neglect.
The abuse started the day after I was born, with my father putting alcohol (cognac) into my pacifier just to make his friends laugh. My father expected me to spit it out. Instead I sucked on it (the only time I actually kept the pacifier in my mouth). After that it was a free-for-all.
I am describing here my experiences. I am not telling you what you should do or providing suggestions. I wish you all the best with your therapy. Just beware that if side effects show up, that it can happen. You have a right to ask for a different therapy style or a different therapist.
I was introduced to EMDR by my 22nd therapist. The first two appointments went really well. At the third appointment I had "unexplained" side effect. During the appointment my brain synapses began firing and did not stop until the day before the next appointment. This continued for 1 1/2 years during which I was hospitalized three times because all of my memories (which I had never lost) began replaying as continuous flashbacks. Normally, I have flashbacks triggered by one of my senses. EMDR was continued by another mental health practitioner and I had a repetition of the same side effects.
From my 23rd therapist, I learned that my side effects of EMDR were typical for "complex PTSD". Therapist #23 made sure that that treatment was stopped. We tried other things.
For the past 1 1/2 years I have been working with my 24th therapist. She seems to be trained in many different therapy styles (e.g. mindful cognitive-behavioral therapy, play therapy, sand therapy, somatic experiencing). She explained to me that for people who have experienced complex trauma throughout childhood are easily triggered by EMDR. It is known that it is good for individual traumas, but not for trauma throughout development. She always emphasizes that it is important not to re-traumatize the client.
Best wishes on your journey!