Asia, I wanted to say I can really relate to what you've said. Getting attached to a T was VERY scary to me, probably the scariest thing I've ever done. Strangely, it's not always scary because we see them as dangerous or even just that we fear abandonment. Sometimes when we start to trust a T, the safety we feel with them starts to bring up all kinds of feelings that we had held at bay for a long time, and we feel fear because we are afraid to face those feelings, or afraid for anyone else to get near them or even know about them. In my case the only thing that helped in the long term was to stop fighting with the parts of me that were afraid to get close to my T and listen to them, find out what they were afraid of and what they wanted (from me and from her). I was only wise enough to do that with my second T because with my first one, I forged ahead ignoring my fears, destabilized and wound up getting referred because my T thought I needed someone who would take emergency phone calls.

In the shorter term, I am glad the breathing exercise helped! One thing that helps me a lot with anxiety is a body scan meditation. You can find a lot of guided ones by searching for "body scan meditation" on youtube.