Jingle Bell ringing-so cute! I'm not an animal psychologist, or anything but I think your cat is just a bit neurotic like most cats, and otherwise fine. Mine is a Tuxedo cat, she is 6 years old, and does the same with the nursing motions,although she seems to be affectionate while doing so. she likes to knead my feet which can be a little annoying, but its a routine now, at night, and I just bear with it to let her have her joy :P She has had 2 litters in the past(she's fixed now), and ever since the last litter, she loves for me to knead her tummy and she gets this look on her face of pure content, as if she's dreaming of her kittens. She has never enjoyed being held, and her new thing is coming and going out of the house multiple times a day, accompanied by desperate mowing, It seems a little senile..but its funny.