Hi nemsmom,

I am going to assume your lung function was fine

Sighing could be your way of getting more air. Many times this happens when we are not breathing correctly or holding our breath. It is possible to forget how to breath correctly.

Learning correct breathing techniques can help. Breathing does not always come naturally, we have to work at it . Start trying to focus on your breathing, paying special attention to breathing from the diaphram. It can take time and practice.