@rab I have had problems with anxiety. If it is anxiety, then it can manifest in many ways. Some people will breath fast, others will have pain in the chest, and some may feel faint. If you have anxiety, the doctor could have suggested a medicine to get you through the worst. You could also try therapy. You have come up with an observation about your condition by yourself. That is great. You could still try therapy as a way to determine if the cause is from something in your life or a chemical problem. I take an antidressant to control my anxiety. If you want you could continue with your self observations by looking for something you have happening or are doing at the time the anxiety happens. My anxiety is worsened by any stimulants -- caffeine, msg, and chocolate are common sources. I hope this helps you to find help for your condition.