marienewland,
I did not find your questions to be intrusive. It took me so long to find this site which helps us all with new ideas and treatments. (& I was diagnosed in 2022 @ Mayo!)
Cisplatin was never mentioned to me by Mayo or my local oncologist. Just the gemcitabine & Abraxane did do a fantastic job:) You are not a "Debbie downer", I get my CA 19-9 checked monthly. I have a CT every 3 months. This month is my CT and I will see my oncologist 4 days after the CT. My CT went down 2 (34.9) points @ the end of January but is up to 43.6 in Feb. and we will see what is going on. I hope it comes down again in March. It has been as low as 8 about a year ago. My understanding is that it can fluctuate depending on lots of things like inflammation, gallstones, emphysema & benign breast disease to name a few (all of which I have). So I am waiting to see what this month brings before I start to worry.
Life is much better on a break but the concerns do not go away. Must stay vigilant.