Steph do you think you could have had some sort of anxiety attack? You may have panicked feeling the changes in your body getting hot and the shortness of breath may have been a result of your worry about being pregnant. I know I worried about everything; feeling pains, not feelings pains, lack of nausea, cramps, back ache. Have you had anxiety attaches before.
I used to have baths so hot that when I stood up to open the window my head would swirl and I would loose my sight for a few seconds. Obviously that's something to avoid x