How do I stop this crackling noise in my ear?

I've been sick for the past two days with headache, sore throat, and nasal congestion. However, after a lot of rest all I have now is nasal congestion and I am taking CVS brand nasal spray to help that out. But I'm just about to go to sleep when all of a sudden, my left ear, and only my left ear, starts making crackling noises. It's like someone is popping bubble wrap inside of my left ear. It's driving me crazy, and I can't get to sleep. And my ears are free of wax, so it isn't wax build-up. Please help me! Thanks!