How Quick?

My sister called today to tell me that the district nurse had been to visit mum today and she had called the doctor out due to the pain. The doctor then wanted to put mum on a drip. My dad refused as mum has a hospital appointment tomorrow. Apprently mum has not been very lucid today and she is very confused. I am worried as tomorrow I am taking her to the chemo clinic for a visit as she is due to start chemo, this is to prolong the enevitable not to cure. The tumor is 4 half inches in the lung and has spread to the osophagus and lympnodes. If the doctor wants her on a drip does this mean she is not strong enough for the chemo. She was diagnosed 9 weeks ago and she has gone in that time from have a lovely 3 mile walk with me to 2 weeks later mainly bed bound, mainly due to the uncomfortable pain, but getting out into the lounge, to not getting out of bed at all, the pain is uncontrollable and the doctor wants her on a drip. She has not eaten in weeks, but she is having complan. She is on 45 milgrams of morphine but still in pain. This all seems too quick for me, is this a sign that things are just going to get quicker and quicker and the end is nearer than I thought. Mum asked not to be given a time scale but I need to prepare myself and I had convinced myself that I would get to do one more everythings .... mothers day, birthday, xmas ......