I Have Been Experiencing A Feeling Of My Breath Being

I have been experiencing a feeling of my breath being taken away at certain times. Not hard to breathe but a quick flutter or no breath! More often in the afternoon and I am overwhelmed with day and feeling anxious. Does not seem to be constant but just here and there 1 or 2 times and then subsides and will come later on when doing nothing and relaxing. I have a lot of stress with work and with home life....wondering if I get my self worked up. There is a family history of heart problems and afib.