How can I get my ears to pop?

So yesterday I went to the swimming pool. Afterwards my ears were plugged. Then I used a Q-tip to make my ears unplugged, but it just made my other left ear completely plugged! Now I can’t hear amything in my left ear. I regret using a Q-Tip. What do I do? How do I make it pop? And are my ears going to have an infection? Please help.