I didn't even know that this was a matter of debate. I had moderately serious heart problem (atrial murmur, sort of the less-serious cousin of afib/atrial fibrilation) and it was extremely clear to me that whatever was happening in my chest was also directly spiking my feelings of anxiety. To be clear, I mean a direct heart->anxiety link, as opposed to "I'm thinking about my heart problem and therefore my anxiety is…
They can both feel like tightness in the chest and from what I was told, the brain isn't good at separating signals. So your body feeling anxious leads to your brain feeling anxious. It's a wonderful cycle. Throw in asthma for more fun. Now you have three possible problems that can all trigger each other! Get sick and feel short of breath? Now you have four! Aren't bodies fun? :D