So sorry. I experienced similar with my dad - his lung cancer first presented as severe headaches. He was found to have brain mets. Every individual's experience is so different. If it gives you any hope, this was six years ago. My dad had surgery immediately to remove two big tumours. It started growing in his brain again a year later so he had chemo and radiotherapy to kill the mets. He could then resume targeted therapies. Against all odds he is still with us today though unfortunately the brain mets have recently returned fo a 3rd time so he is having more chemo and we're having to wait and see what else, if anything, they can do to manage it. Hopefully, something can be done to manage your mum's disease for a while yet too. Regardless, it's impossibly hard. The anxiety and emotional stress is debilitating sometimes. I empathise.

So sorry to hear about your mum and can fully appreciate your pain. My own mum had lung cancer with brain mets a few years ago and I found the confusion very difficult to deal with. The consultant spent time to explain where the Mets where in the brain, and the potential difficulties that having mets in these regions may present. This did help as I found it easier to make a little bit of sense of her confusion. All of this is difficult to process and i can understand your feeling of just needing to put this somewhere. I do hope it has helped and that you know people are always willing to listen.