Ear plugged after a cold?

I had a cold for about a week. (sore throat and runny nose). I finally started feeling better and I woke up the other day and I could barley hear out of my left ear. It feels plugged. I've tried everything. Olive oil, heating pad with a wet washcloth, peroxide, decongestants, hot showers, plugging my nose and blowing, I don't know what else to try. When I yawn it pops a little, but nothing major. What else should I try? If it doesn't get better by Tuesday, I'm going to the doctor. Thank you!