Well, first of all, I don’t like giving advice in areas that I feel deserve trained and licensed care. Domestic violence is an emotionally scarring experience that deserves professional attention, support groups, and not some blogger’s opinion, so you should be careful who you ask for advice on topics of this nature because you may get advice that will not help make you a stronger, more complete individual in the long run, but hurt you. That all being said…
“Do you have any experience with subs who were in abusive relationships?”
My answer: No, I do not. None of my ex gfs in the past were with abusive men before me, so I cannot say what it is like to emotionally deal with the emotional aftermath caused by a man who physically abused a woman I was with.
“I’m worried about being triggered during a scene or while with multiple partners.”
You should talk with a professional before seeking a relationship of any sort, not just BDSM or casual sex or anything intimate. Not because you are “so fragile” and “weak” or some other BS – I will at least not bullshit you and give you some lame line. You should do it because, what if you find that once in a lifetime love-of-your-life person, and you go and fuck it all up, because you don’t know how to emotionally navigate a relationship. We all have been scarred in different ways. We all need to get past things. Being cognizant of what “those things” are is a big step to getting there. Therapy will help you become cognizant and arm you with tools to address things head on, so when Mr or Mrs right comes along, you will be able to have a healthy love with them. Then break out the flogger and ball gag.