I imagine that whatever you have been working on currently brought this new symptom to the surface. I never had a problem with my brother (except thinking him a jerk, lol) then I started working with a trauma t and unearthing CSA stuff that I have never remember, just suspected all this time. then my bro texted me out of the blue and wanted to meet up because he was in town. I totally flipped out. physical reaction, major anxiety. had to leave work and had ER session with t it was so bad. turns out he was my molester. but it never surfaced before I had done all this work. so I think as you uncover more and more, different things will surface for you.