Blood pressure fluctuating

Ra
The past 2 mornings I started having a hard time breathing, tight chest and feel faint. Even laying down doesn't help, so I downloaded a blood pressure app. My blood pressure was 147/93 (or close to it) with resting pulse of 110 (I double check my pulse manually and it's right) through out the day. Eventually by the afternoon, it is back down to 120/80. I freaked out, but my husband thinks I'm over reacting and causing my pressure to rise or the app is wrong. I have an appointment to check it out in the am. Anyone have a blood pressure that fluxuates that much thought the day?