Aww gurl this is actually heaps normal if your worried this is abnormal. Many girls get different symptoms of when they period is going to start (AGAIN* that monthly or more cycle ) usually lots of girls /woman get cramps or back pains when they are soon going to get their period , and dizziness may result from back pains and cramps , it can also be due to lack of sleep from cramps or this feeling you get when your about to get it , but I would just say this is normal if you do get dizzy , to get rid of this try to take naps and drink heaps of water and eat healthy food :)
