What Causes Nausea,dizziness And Sore Throat?

my girlfriend and i had sex for the first time a month ago. she has been on the pill for 5 months, i use spermicidal condoms. she left for a family vacation on saturday and on tuesday she started getting symptoms, natious, dizzy, sore throat when she swollows, which hurts her ears. she is also craving foods but they are foods she normaly craves... but cheese which she normaly loves is making her natious even the thought is.... she gets motion sickness and they have been doing a lot of driving, she has been in the heat a lot, and swimming which she doesnt normaly do. they have been hours back ridding, and out to eat at a pizza joint sense the symptoms started. im not sure if we should worry about pregnancy or just the trip and being so active is messing with her?