Left Elbow Hurts

Just want to note that my left elbow hurts.  Not a lot, but it's noticeable, and it hasn't gone away.  It hurts especially when I try to straighten my arm.  I think it started ... oh, crap, maybe a month ago.  I think it started when I slept on it really hard.  Well, I guess, I don't know.

Like with many annoying ailments, I just didn't really think of trying to fix it.  I notice it, but I have to get on with my day, so I take note of it and then hope it goes away.  This isn't going away.  I don't know how to get rid of it, and I want to get rid of it, but it ain't going away, and that's starting to freak me out.