I dont know why i feel sick

Honestly ive been feeling really sick lately im super nauseous that hearing someone gag or cough makes me gag and smells make me feel so sick like pickles, kraft dinner, bananas o kust constantly wanna puke. And had pain in my left lower back and hip. I dont know if its just my anxiety or what but i took my lorazepam to see if it would help and it didnt. Ive been on birth control for almost 9 years now so i highly doubt that im pregnant i take it religiously so i dont understand why im feeling ao sick