On Meditation From Shree Vasant's Teachings

Do not seek to attain beautiful experiences in your meditations. We do not meditate for experience alone. It is as you would give a gift to receive a “thank you” or some gift in return.
When you meditate it helps you in a much subtler way than actual physical, mental experiences. It also helps those around you. Do not think, “Oh, I had a bad meditation.” Sometimes it is delightful, other times very subtle. If there is some disturbance consistently in your meditations, check your diet and posture during meditation.

Regular practice of Pranayama itself may alleviate all or part of the difficulty. This ancient breathing technique is excellent for the mind and bodily functions.