Over the recent months, my boyfriend and I have noticed that after sex, usually when it's particularly long and physically demanding, I will start to hyperventilate/panic attack. We've tried keeping a water bottle by the bed to drink during the act, switching positions up and not going for as long. These seem to work a little bit, but not fully. When this happens, my chest feels tight and my arms are freezing. My thoughts are it's something emotional rather than physical causing this. We've also noticed that this happens when he is heavily influenced by alcohol/drugs, or when he's being an as****e. I am also on the pill and have been for about 9 months.