LOL Fiona, it sounds like you and I used to share a wardrobe although I've always had a thing for costume so I tended to walk out my door looking like a 50's housewife one day and the next day I'd be more in the mood for a fly-girl or harajuku look lol. I think that bi-polar might be the best word to describe my wardrobe.
I think a stylist is a great idea but just remember they're not an expert in being you so feel free to adopt any advice you like and ignore that which you don't.
Try and find one through word of mouth so s/he is more likely to fit with own personal asthetic (maybe Lulu's freind?).