Now that you understand a bit more what you are feeling unsafe about, you can work through it. I hope that you will share these insights with your T. The way to conquer fear is to face what you are afraid of. Change can be really hard to deal with. Being sensitive to place makes sense too - that also happens to me. Most likely, going to the new office, or maybe something about the new office, is representative of something else to you - some scary experience from your past, or something that hurt you. It is probably something that affects you in other aspects of your life too. And it probably feels much bigger and more powerful now because our minds tend to blow things up and when we feel afraid and we act on the fear and dissociate or run away or otherwise escape from that thing, we give it more power and it seems to grow. What you can do with this is look at it and examine it and put it in its place. When you do that, you will have the power, and it will lose its grip on you and won't be able to affect you and your life so much anymore.

You are doing good work here.