About a week and a half ago I got elbowed in the head playing basketball. I had to put my hand on my head but I didn't lose conciousness or throw up. Since then I've felt like an air head kind of and have had issues concentrating. The air head feeling comes and goes. I went to the ER a few nights a go and they said I was fine and didn't even give me a CAT scan. I have health anxiety so the symptoms drive me crazy. Basic question is am I fine or should I get the cat Scan to make sure there's not a blood clot or anything? Thanks.