I would take this opportunity to preach to you about Jesus, but I don't think I'm supposed to do that on this website...
And yeah, I'm being completely serious.
I won't evangelize to you guys, but the story has something to do with it anyways. Whether you believe it or not, is up to you.
Here's a story of something that happened to my Mom's best friend, who happens to be a very devout Christian named Caroline.
One night, she had gotten into an argument with her husband. I don't remember why or what it was about, all I remember is that they hadn't been very pleased with each other. They went to bed quite upset, and hadn't forgiven each other. And some time in the middle of the night, Caroline woke up and was in a situation somewhat like yours - she was having difficulty breathing, and felt like someone was trying to strangle her by putting their hands around her neck. She opened her eyes, but no one was there and there wasn't anything physical around her neck. Being the Christian that she is, she immediately started saying in her mind, "Hallelujah, praise the Lord," over and over again. After a few repetitions, she was able to breathe slightly and started saying it out loud, in a low whisper. Again, she said, "Hallelujah, praise the Lord," many times. It took a few more times, but she became able to say it slightly louder, and louder again, until she was nearly shouting it but still felt like someone was trying to constrict her breathing. After some time, she saw what she believed to be Satan or one of his demons, trying to strangle her. It had manifested physically. She threw it off, and it faded.
After that scary event, she knelt down to pray to God, and tried to find out what had given it an opening to harm her. In her prayers, it was revealed that Caroline hadn't forgiven her husband from their earlier argument, and she didn't feel safe enough to stop praying until she had completely forgiven him.
I have a few more stories like this from church. Pretty interesting stuff.
Edit: I think
Zaex might have a certain Family Guy line that he'd like to say...