This is going to be a short post. It's really just an experiment; it will work differently for everyone.
The aim of the experiment is to see if, by doing a short visualization, you can change an uncomfortable feeling to be less uncomfortable.
Can you notice any uncomfortable feelings right now? Maybe a lingering grumpiness in your gut from some offense earlier in the day?
What does it feel like? Is it tight, or loose? Warm, or cool? Does it have a shape, color, or texture?
Now that you know what the uncomfortable feeling feels like, ask yourself this question: What's the first image that comes to your mind when you ask "What's the opposite of that uncomfortable feeling?"
Is it a star? A smell? An easing in your body? A donkey kicking a barrel? It doesn't matter if it's a picture, a feeling, a thought, or a sound- just notice the uncomfortable feeling, ask for the opposite, and see what the first thing is that appears.
Now that you have it, sit with it for a moment. How does your body feel as you see/feel that image? How does it feel as you see/feel that image for more than a few moments, even as long as 30 seconds, noticing your breath as you notice the image.
And of course, how does the original uncomfortable feeling change? Does it increase? Decrease? Shift in some certain quality?
That's the experiment: What happens to the uncomfortable feeling when you introduce yourself to its opposite.
Let me know how it goes.