PTSD vs CPTSD: Does it Matter?

my (now ex)therapist told me that i had ptsd and i was still actively being traumatized since i’m still in the situation dealing with the triggers. when i brought up that i might have cptsd, she told me that “it’s not a real diagnosis since it’s not in the dsm-5”, and that i just have ptsd. i’ve gone through a lot, i think i might have cptsd since there’s a lot i have yet to voice out loud & process. i can’t tell if that’s just me being picky about a name to my diagnosis, but for some reason it matters a lot to me. when my next therapist asks me what i’ve been diagnosed with, should i say ptsd or cptsd? was my ex therapist right or wrong? does it even really matter?