Bad loss of focus and memory?

Recently, I have not been able to focus on anything. I never do my homework because when I pick it up, I will start to zone out. The zoning out has gotten so bad that it feels like I am not even alive. I also can't remember things that recently happened. For example, the other day I had a screwdriver in my hand, and I set it down somewhere, and I couldn't find it 5 seconds later. I am generally a happy person, nothing to be sad about, and my life is average. I don't have headaches or anything, and I usually eat healthy. Could this be some kind of illness?