I suffer from hemorrhoids and so I am unable to sit for Hong Sau technique. Will it be effective if I do it lying down with my upper body slightly elevated?
When you have any body discomfort, you can adjust your body to allow you to practice. Yes, you can lie down with the upper body slightly elevated.
You can also meditate while sitting on a special pillow for use with hemorrhoids.
At the end of your meditation practice, you can visualize light and send it to the area of the hemorrhoids for healing.