When my period ended i started to feel sick and been having small sharp pain in my stomach with butterfly feelings& getting hungry more often help pls?

Vague symptoms : Those are vague symptoms so it is going to be hard to pin something down. Most of these are intestinal symptoms. Lots of things can cause pain in the lower abdomen. Start with your primary care doctor to help organize the evaluation.

listen to your body: Something is not right. Possibilities include low blood pressure or low blood sugar or both. For that stay well hydrated and eat small meals frequently with slow carb grains, high quality vegetables and proteins and 1-2 t flaxseeds soaked, rinsed and added to food for good oils. Iron deficiency is a possibility if periods are heavy. Do you look pale? What about vitamin d?