I promise I will avoid repeat postings whenever possible. However, there are a couple points that are so important that I will repeat them often.
Never permit even the slightest physical or psychological discomfort or distress during any breathing exercise. There are no exceptions to this rule.
Pain, discomfort and apprehension are all messages from your body and mind, alerting you that something is not going as well as it should. STOP!
At that moment verify your technique, your rhythm and your concentration. Only when you feel completely at ease, begin again.
Never practice mindlessly. It is a waste of time. Know that the more you practice, the easier and the more rewarding your practice will become. Your breathing awareness will unfold quite naturally as does the flower.
Be well. Breathe beautifully.