Clogged ear when laying on left side
So for the past 3-4 weeks I've been having this strange problem where when I lay down on my left side, my ear gets clogged, almost like it has water in it. I noticed it started happening about a month ago. It's only on that side. When I wake up in the morning, it feels clogged, but as soon as I get up and walk around it goes away, and doesn't bother for the whole day, until I lay back down on that side. There is no pain or anything, just the general clogged feeling. Any ideas what this is?