When I was meditating I felt really tense. My head was hurting and I felt I was pulling. What should I do in a case like that?
If you get that kind of tense feeling, immediately breathe in and out very quickly. When the rhythm of your breathing increases, the tension goes away. Try to feel that you are climbing up a flight of stairs or a ladder that has many rungs. As you climb up you are breathing in. If you feel this ascent, then tension goes away. Tension comes when you are stuck at one place. But when you are climbing, you are like a bird flying up into the sky. When the bird is soaring, where is the tension? Similarly, if you are climbing up, there will be no tension.