New at this

@Cruiser excellent news that you are taking time off work to recover.  Even if you feel ok after the surgery, I think it's the mental and emotional exhaustion that you need to deal with as well.  There's a book called "Body Keeps the Score" by Dr Bessel van der Kolk where he examines just how much trauma affects all parts of the body but especially the brain and the neurotransmitters.  Self compassion is something I really struggle with but it's something that's very important during these horrible times of stress and cancer.  So put yourself first - that's the priority.