I too was in desperate need for a nanny awhile back too! I found
www.nannyservices.ca they have nannys and mother';s helpers listed. You sign up free and look for people who fit your profile. You can contact them via email or phone right away. I had 3 immediate responses (for Pt overnight help which is much harder to find). The ladies were all very nice and had references ready. We never went through with the nanny. I was lucky enough to have my Mother in law help out. I really liked this website and what is has to offer. Good luck!