EMERGENCY

This whole week I was feeling just fine.. and today since I woke up I haven’t had any appetite, i was craving a salad so i went to purchase one.. i was almost half way done when I rushed to the restroom and vomited EVERYTHING. I’ve been trying to eat small snacks and fruits and everything comes back up😢 I feel the urge to vomit but I don’t have anything in my system so what is there to vomit? I tried soup... didn’t work either... should I go to the ER? Or just wait it out? I feel lightheaded as well.