Hi Suzi
This is a tough thing to go through and I think we all need the help of others on this rollercoaster. I have a few wonderful people who always make me feel better and sticking with your positive crew is a must. I also started writing things in a book that made me feel better so when I feel anxious I can remind myself of them to perk up. #never give up , is one! I have tried a mindfulness course also to try keep mind from wandering and to enjoy the moment. Sometimes it is the little things like reading a novel or even tiding up which help. I did a jigsaw in the summer which got me through a very difficult time but without that I may have driven myself crazy.
You have coped this far in and will do again , the horrible time now will pass and you will feel better when new treatment kicks in.