If you have knots in your gut one of two things is happening (most likely). Some one is attacking you. You are making a mistake. Be careful to differentiate the two.
Making your energy flow up your spine can clarify things. It can be taught. That is called Kundalini Yoga. Or it can be shown to you if some one cares enough.
Purity is strength. Don't forget it. And don't forget the energy is on loan. Use it with compassion.