How can I overcome my health anxiety caused by short breath?

Hello doctor,

I am a 21-year-old female having frequent gastric issues. I have a moving pain due to gas in my abdomen and breast. Recently, I experienced bloating in my stomach, and I occasionally get a little shortness of breath. However, I have discovered that while I feel normal, I experience health stress when I am busy or distracted. I think about my breathing patterns and end up getting short breaths. I feel the shortness of breath is psychological as I overthink. Moreover, I can climb stairs, sleep properly, and walk. I suffer from only a short breath and gas. I am concerned if the issue is heart-related. Moreover, my pulse is 90 bpm at rest. In the past, during weather changes, I had slight shortness of breath. I am currently taking Biotin Plus. Please help.

Thank you.