Do I have a concussion?

I hit my head on my bathroom cupboard really hard yesterday morning. I got extremely tired after, ended up taking a 3 hour nap 6 hours later, woke up dizzy, pretty disoriented and had difficulty walking. I'm real tired all the time, but have a hard time getting to sleep. I have a cut on my head, a throbbing headache. My ears are ringing every hour or two. The pain around the cut, traveled down into my ear and left eye. I'm not about to go to the hospital because there's no treatment for it and I don't appear to have any brain damage. Does it sound like a concussion? And what can I do to make it better?