What is going on with my body?

You could possible be pregnant- not all women ovulate midcycle. If ur not it may just be an off month if its the first time its happened. Perhaps you have a viral inner ear infection it will give you all the same symtpom of nausea and loss of appetite and all that. Wait and see if u get ur period and if not test. If the test is neg and you still have the symptoms just see a dr to make sure everything is ok!