I have suffered on and off with anxiety since my late teens and have many panic attacks in my late 20's (58 now). They are just awful!! BC came along for me 4 years ago when I was actually feeling the best physically and emotionally for a long time. After the intial anxiety at diagnosis, I settled down and actually coped quite well until two years in taking tamoxifen, which messed with my emotions, and my husband being hospitalized for major depression. This really hit me hard and i went into a bit of a spin. I saw a counsellor who was amazing and my oncologist prescribed me lexapro which I am still taking and which has helped me cope much better.
I would see be if you can find a counsellor who you can relate to, so nice to have an objective, professional ear to listen and advise. I also found guided meditation helful on days when I felt really overwhelmed.
You are going through a lot, be kind to yourself and take care. It will get better!
Big hugs,
Michele