OMG Anne...we would all be freaking out waiting to find out what's next. Your f/u appointment with the oncologist will help with that.
Things that have helped me:
I saw a dietitian as rapidly gaining weight due to inactivity (not able to work on chemo) and exhaustion so very poor good choices during the day. I was living on cheese and crackers and toasted sangas...as that's all my tastebuds wanted and my energy allowed. She gave me some really good nutritious shelf ready practical tips that I have taken on board and have at least stopped gaining weight.
As to exercise managing that is doable when working full time but you may need to build up to it...after all you haven't long finished treatment. Idea is to do it in 10 min sessions. You could eventually do x 3 sessions which is 30 mins a day. 10 mins before work. 10 mins at lunch. 10 mins after work. A fitbit it a great motivator or something similar. You could see an exercise physiologist who could work out a strength program for you at home. Couple of dumbells, a step and your own body is probably all you need...and most could be done watching TV.
The exercise can really help with anxiety...as it burns off some adrenalin. But it may be beneficial to perhaps see a counselor to talk through things if it doesn't settle.
Hoping things become clearer for you. My mastectomy was done pre chemo so really there is no way to know the tumour response in my case.
Thinking of you.
Kath x