I know what you mean about the screaming! I only have to pull on ONE hair while grooming Pixie and she screeches like i am murdering her!
I had a scare this morning while she was sitting on my lap being groomed, she was sat very still when all of a sudden she acted like she had an electric shock and almost flew off my lap!
I have no idea what happened to her, I wasn't even actually combing her at that moment..it was the oddest thing! she's very tiny and isn't able to jump on/off furniture by herself...if she had hit the floor i swear she would have broken bones.