Ah, Babies are like that... my nieces and nephews (as well as their little ones) are the same way. Always seem to be able to tell when you "take a load off"... or better yet... sense the moment you are trying to lay them down!
As for wild little ones in the Dr's waiting area, I am pretty sure that would have gotten on my last nerve as well! I can't stand it when mother's act like the children aren't even theirs and don't discipline them.
I'm glad you're getting seen for the health problems. I hope they come up with a diagnosis and some measures to help you soon, I so hate to see people I care about hurting. *hugs*