Yesterday during tackling practice I got hit in the head twice. The first time I was tackled by a girl and hit in the front of my head with her elbow. The second time I was tackled and my head got slammed on the ground really hard. After the second the tackle I saw a quick flash of light and then I got up. I was pretty much ok except that my head hurt and I had some trouble concentrating on what my coach was saying and one of my teammates said that I should sit down for a bit. The trainer on the field talked to me and I sat out for about 15 or so minutes until preactice was over. I started to get nauseous after a while but didn't throw up and I kept getting headaches even after taking medicine for it. Today when I woke up I was still getting headaches and neck pain in the upper part of the back of my neck. Are these headaches common with head injuries or should I go have the trainer check me out again?