Possible flashback- what does this mean for me?

Hi,

I've recently come to terms with my C-PTSD. I've been denying that it is something that I've been dealing with for my whole life and recently I've had a break through in therapy.. I understand that labels don't matter but I was denying my symptoms as well but now I'm really making great strides in coming to terms with it all. (so, that's a plus lol ) But.. just the other night I had a lets just say an "unusual" panic attack.. This one wasn't like my normal ones that I have from time to time, this one lasted a lot longer and I felt things I've never felt before. I believe that I suffered from a somatic flashback. Earlier that day I was focusing on what my life was like growing up becaue my therapist's hypothesis is that I have repressed thoughts, feelings, and potentially memories from back then (essentially I've blocked out anything I thought was negative and only focused on postive things) and that they have been resurfacing over the years. So when I really objectively reviewed my childhood, I started to remember things I had long forgotten about. Nothing bad, just random thoughts, smells, emotions, experiences, that sorta thing. But like in an instant, it was like my body remembered somethign that I didn't. I felt like.. now this is very uncomfortable to put out here but.. I felt like a physical arosual down there? and that immediately reminded me of other times I've felt that as a kid, no specific memories just memories of that feeling. I tried to put it out of my mind because it was a very unpleasant feeling and I didn't want to think of it's implications at all for the rest of the night and possibly forever. But as I tried falling asleep my heart just started pounding out of my chest.. like i've never had a panic attack like this before it was so much more intense and so much scarier I felt like I was dying and that I had to run out of there like I was just so scared. My panic attacks usually subside after ten minutes but this one was just staying and maintaining its intensity. Luckily my therapist taught me some grounding techniques that helped a ton (I think he called them bilateral tapping?) and I had some xanax on hand prescribed for occasions such as this one. I'm not sure if what I just experienced was some sort of flashback or if it was just a bad panic attack, but I know that it must be related to that feeling I remembered. That's the part that frightens me to most. That feeling... would it imply some form of sexual abuse? I just can't comprehend that at all, like I just can't believe that. How could that be possible? How could I forget something like that? Did it even happen?? Was what I felt real? I don't know.. I'm just so scared its going to happen again, another panic attack like that. I talk to my therapist next week but I need some form of reassurance now.. if anyone knows if this is a flashback or if I'm just freaking out for no reason please let me know. I don't know a lot about ptsd or c-ptsd and I didn't even realize some of the things I experience are actually symptoms. I know this is a lot of writing, haha, I just don't know how to put this in words great. ;-;