I have gone through a very similar experience, i struggled to let my mum know how i felt! You are so strong and your mum sounds like an incredible person. Just remember to look after yourself aswell, make sure you talk about this with someone and let them know how you feel! For your mum to stay positive throughout all this is absolutely inspiring, sometimes putting in a brave face may make things worse! Just remember that what you are going through is extremely difficult and no one expects you to not be upset by this.

hello 

my mum had exsacley the same she managed 4/5 years with it she did amazingly well I was mums full time carer but sadly it went into all of her bones and we last her in November I could never talk to my family/friends I found it very helpful on her but never found someone with the secondary bone cancer if you ever need a chat to someone who has been throw it with a mum im always here x

Hello 

l recently lost my dearest mother from gallbladder cancer which was diagnosed last year oct in its last stages mum recided to go with chemo and radiation just to maybe have abit more time with us.After her first treatment she was going down hill and had to be taken to hospital.She seemed to be on the mend but suddenly had a blood hemridge.She lasted three days after that it was so painful to see my mother dying.she passed away new years eve but died peacefully.lm still in the process of mourning my mother and my mother inlaw now has been diagnosed with bone cancer which is from the breast cancer she had four years ago.its spread to her legs,lungs,kidneys,bowel,spine.She is 74 years of age and lm her carer as l have been for many years.l take each day as it comes but it doesnt seem to get easier l miss my mother very much and lm loosing another.