Hi Janet,
I have had lots of pat downs, a couple of funny looks, a few pointed questions but the only 'uncomfortable' stuff have been the idiots pulling my kit apart, holding up high the tube, syringe etc to the world asking 'what the hell is this' and why I was carrying a 60cc syringe on me...(I have 3 kits on me at all times, usually 1 on my body like a fanny pack or cross body bag, in my backpack and one in my carry on).
I told the idiot that it was sterile, personal and if he touched it again I would shove the tube up his nose...he did not appreciate that...But couldn't say a thing....so he closed it all up and handed it back. (that was London Gatwick)
I have never been taken aside or asked to strip...I would call the police if they even tried it in North America. I carry a handicapped card which sort of helps.
I have refused for a specific person to frisk me (looked like a prison guard) or a particular type of person (angry and aggressive) and pointed to the 'good looking guy with the smile' and said that if I had to be frisked I wanted him to do it 
That stopped everyone in their tracks!
I take it with a smile most times....the pains of travelling...
On the other hand, If I had been you, I would have asked for a cup and emptied into it in front of them!!!!!! or onto their desk!
Keep smiling
Sharon