To work or not to work?

Thanks so much everyone for your thoughts on this dilemma.  Scooper we are very much the same - I am 56 also and planned to retire at 60. This diagnosis threw everything on its head. My employer has been very supportive . I spoke with my boss today and  they  have arranged for someone to cover my position if I feel unwell and can't come in one day or if I have to leave early due to fatigue. They will welcome me back but also don't want me to feel pressured to be there if I'm not feeling well.  I am aiming to be back at work on Monday after almost 3 weeks sick leave. I saw the oncologist today and will remain just on Exemestane and Xgeva going forward. I also take Caltrate, vitamin B12 and a multi vitamin.  I feel happy about this as I feel I'm tolerating both the drugs well. My Oncologist said if they had something better than Afinitor then they would not prescribe Afinitor. She apologised for putting me through the torrid Afinitor journey.  It works for some but clearly not for me. After 3 weeks I am only now feeling better from its awful side effects.  Let's hope the Exemestane can do its thing. 
So I hope that I can settle back into some routine at work and find a focus other than just this awful disease. 
Thanks so much everyone for giving me hope and for inspiring me.  I am getting my head around where I'm at and realising that not everything has to change .  I can do this! 
Wishing everyone good days with good friends , cheers Judy