I Passed Out Yesterday After A Long Workout And Not

I passed out yesterday after a long workout and not eating much throughout the day and I hit my head and got a longish cut throughout my scalp from hitting it along with a goose egg. They said I didn't need to go to the doctor or anything but ever since I've been getting headaches, which I don't get, and some chest pains. Should I just wait it out or go get it checked out?