I'm thinking it's a mix of allergies and anxiety...I'm trying to understand how someone can have anxiety shortness of breath can happen even when you aren't "feeling" anxious
I don't have an answer for you, but that's absolutely how mine went. I struggled with shortness of breath and chest pains for several months, and was constantly terrified it was something wrong with my heart. My doctor kept assuring me (after tests) that it was just anxiety, and I kept trying to tell her that I didn't feel anxious. Turns out, feeling anxious isn't a necessary ingredient for anxiety :) Fun, huh?
That said, I ended up using some medication temporarily that helped me get a handle on it, and, lo and behold, the chest pain and shortness of breath eventually went away. If I DO get anxious over something, I still get the same symptoms, but now that I have accepted that it's anxiety, it's not something that I struggle with all the time anymore.