Hi
@cesar66 I have not posted for a long time but I read your post and I felt a need to answer you. My dad had alzheimers for probably near ten years before he was diagnosed and that only happened because he became unwell losing lots of weight over a very short period and then within months he was diagnosed with oesophageal cancer. Yes double whammy for me too and everything that comes with it.
I didn't suspect cancer and neither did his GP We had concentrated on the dementia which was all too evident and I can't blame anyone for not noticing the cancer. Sadly treatment was not on the cards for dad but he did amazingly well and lived another two years which far exceeded his prognosis because his cancer was far advanced when it was discovered.
I will say that I did everything possible to make things nice for dad and I think he was happy most of the time which is more than I could hope for and this has given me some comfort in the three years since he died although I still haven't really comes to term with it even now. You seem to be a very caring person and I think you need to concentrate on what you did do and not on what you were not able to do. In hindsight we would all do things differently but this is not possible and we just do things the best we can at the time. I am sure that you did your best and your mum would have been happy with that.
Give yourself some time because it is not your fault, it's nobody's fault. It's just a hard thing to process and deal with. I am still dealing with it three years later and I know that I did my best and it was not my fault and dad would hate for me to still be feeling bad after all this time. It's early days for you but just give yourself time.