Hey S-V,
i'd second what TG said, without knowing specific details, it' s hard to comment...but i'd definitely recommend having a look at those threads he suggested..and, from there, if you want to share anything with us, everyone here is happy to listen and speak up if they feel they can help.
i also very much agree with what jade said, sometimes, it can feel like you're over something and something apparently insignificant can trigger it and i think that in the realm of BDSM and sexuality, this can be quite disturbing, but can be overcome, especially with a loving and understanding partner.
Hugs to you.
sl x