Heart rate

En

Im at work and feeling really tired and heavy. My blood pressure is okay, oxigen level is fine but heart rate is 120. It’s been like that since 9 am and now it’s 2:15 pm . I asked my midwife and she asked me if I had fever which I don’t and then she told me to eat and drink something and sit for 15 min to help with the tiredness. I fee a bit better but my heart rate still at 120. What do you think ?