I have dealt with stomach issues literally my whole life directly related to my anxiety. I often feel nauseous right before an attack or during, or the nausea can cause the attack… its sort of a vicious cycle at this point. I totally think that what you are feeling is normal and have come to learn our bodies and minds can latch on to a different feeling and make it feel so much more intense than it is. I have realized this as there have been times I have gone off of my meds thinking, "I'm good!" - only to find the strange head sensations have returned (for an example). I have them all the time most likely, but when I am "well" I do not even notice them like the average person - when I am unwell, the second I feel something in my body out of wack, I latch onto it and it becomes some HUGE thing.