So I start my period in about a week, my boobs are sore, my lower back hurts and I have all the normal pms symptoms but one I'm not firmilliar with... nausea when I smell cheese or anything else and I feel like I'm going to puke. I opened my lunch box and I couldn't even eat my sandwich because the smell of the cheese just made my stomach turn.. does anyone else have this pms symptom or should I be worried? I'm on birth control but my boyfriend finished in me about a week ago and I'm just being paranoid I think.