I think you're really lucky if not much has changed in 13 years! My doses of insulin have changed a lot over the years dependent on what the doctor has suggested, how much exercise I am doing and how many bad (ie yummy but sugary foods) I have eaten.
I've also noticed colds change my insulin needs (they go up) and being relaxed makes them go down!!
My hypo awareness disappeared when I kept getting lots of hypos in a short period of time. However they reappeared when the hypos stopped occurring so frequently.
The only way I can tell my sugar is high is thirst I think. Do u get any other symptoms?
I try to not get frustrated by the need to change my insulin doses. But it is a bit of a pain.