You know, it's hard enough to say "no" and mean it. I've practised hard over the years, but the truth is I like helping people. Not in a martyr kind of way, I just genuinely like feeling useful, and know how much I appreciate any help - what goes around, comes around, right?
So it's kind of like a kick in the teeth when, just like the wobbly six year old just learning to ride a bike, you are just mastering this new skill when you seem to keep riding into the proverbial brick wall.
You see, I AM getting better at saying no, knowing my limits, pacing myself (honest!) and only taking on what I can deal with - beyond the usual essential stuff I sometimes feel I can't. (But that's another story...)