When i don't have period for a month, i feel dizzy, headache, lightheaded, my face was hot, and getting nauseous every nights. what's wrong with me?

If...: If this is a recurrent problem and you have been tested for pregnancy and negative it could be associated with a hormonal imbalance, which may include thyroid, polycystic ovaries, among others. If this is the first time, get a pregnancy test. If negative, follow up with a GYN provider for further evaluation and order of tests if necessary.