Sue, I'm Guessing that they removed the Tail of your Pancreas, given you lost your spleen, or did they remove all of it? I had the head and neck of mine removed. But still ended up with type 3c diabetes.
I am very fortunate I have some specialist nurses at my local hospital's diabetic unit, and I can phone them oe email them. Now with my CGM I can also send them a report about what has happened.
I find my sugar levels vary wildly with peaks after eating, but also lows usually after sleeping or exercise. Apparently variation is more extreme in this condition, but my nurses seem cool with it so long as I am in range 2 hrs after eating.
If you have access to a support nurse it could be worthwhile talking to them.
At the moment I have not changed my eating habits, but I am seeing a dietician next week so that may change…
I hope you get it sorted. <hugs>