Hi Anne - what a journey! Your anxiety is completely understandable. I've been going through a similar emotional roller coaster for different treatment reasons. I also work FT. I have tried a few things to help me manage. I have always done quite a bit of walking but it wasn't helping. I tried meditation and ended up with dual conversations in my head - my anxious ruminations fighting with the meditation cd. It didn't work. I was tossing and turning all night and couldn't even read a book. This went on for about 6 months. What helped me were thtee things 1-a series of counselling sessions with a specialist counsellor for breast cancer ( referred by my breast nurse). I got a mental health care plan from my gp so i could claim most expenses. 2- i did join a female only gym. I needed a lot of physical exercise to get my brain to stop. I decided to make the trip to the gym on the way home from work a high priority 2-3 times a week. 3- i joined the research program ICanAdapt.com and this has given me some helpful techniques.
I hope you find something to help you. It's exhausting to be in that state!
K