Lots of empathy coming your way Mytai, both for the pain and shame and confusion of the body memories themselves, and for the struggle to explain or share them.
As many others have said, I too have experienced them on and off for a long time now, but didn't recognize them as such (or want to) until fairly recently when they suddenly became very intense and very persistent, to a point at which I had to confront them.
They also occur for me at times during therapy sessions, but more frequently at night (after nightmares) and as part of other flashbacks and horrible dissociative type experiences. But sometimes in therapy they are there too, sometimes when we talk specifically about relevant traumas, or sometimes just as general shifting pain and discomfort which is part actual body memory and part psychosomatic pain that is really just my body getting on board with my brain to vent its distress.
I have discussed these with my T, also after much much shame and holding back. I trust him as much as I could imagine trusting anyone, and yet I too baulked greatly at the prospect of going into specifics. And then, significantly, I realised that I didn't really need to. I could tell him very clearly without telling him specifically, in the sense that explaining to him that I was experiencing intense body memories that were directly linked to traumatic memory images of X or Y incident of sexual abuse, was as good as telling him that I was feeling pain and discomfort "down below". Our Ts are, hopefully, intuitive people who understand communication difficulties, understand the dynamics of abuse, and are pretty good at reading between the lines. I'm not at all advocating being deliberately ambiguous or playing guessing games with your T as a general rule or practice, but simply pointing out that sometimes we get so carried away with the need to explain *everything* that we forget that sometimes, near enough really is good enough, and in most cases, letting your T know that you're experiencing pain directly related to sexual trauma, is all the detail they'll need to put 2 and 2 together and to help you to work through and process those body memories sufficiently.
Saying embarrassing words for the sake of having said them, sometimes feels like a challenge we have to meet in order to believe that we're "fully disclosing". But shame and awkwardness just on principle are neither necessary nor helpful, and I would bet that your T, like mine, will be able to figure it out and move to validate and support you through your experience without you having to say the actual words that are so hard.
All the very best with your appointment, with the e-mail, and with however else you choose to tackle this. My thoughts are with you.
Maddog