I have bad period pains but im only on day 15 of my cycle. and feeling sick had pain for a week. whats wrong with me?

Could be Hormones: It could be that you have some hormonal issues that could be ameliorated with birth control pills, and/or ibuprofen. Should also consider that your pain has nothing to do with your cycle and the sickness is due to something else, for instance, your gastrointestinal tract, uti? See a doctor if it persists, given that you've had it for over a week.