Started eating healthy and cut out a lot of junk food. also started taking vitamins 4 months ago. my period hasn't come since than? still pms/cramps

Many possibilities: Congratulations on improving your diet and taking vitamins; this can only help your health in the long run. I can not imagine any way that would cause irregular periods so this is a coincidence. There are many possible causes including thyroid imbalances, stress & pregnancy. See a good doctor, preferably with a holistic approach. For more on causes of missed periods: http://bit.Ly/18ogpzs.