Hello, I am a 40 year old female. 114lbs, and for a few years I have been having elevated heart rate. Back then I didn't take by pulse, not had a HR tracking watch, but I'm assuming I had this because of how out of breath I felt and my heart would pump so fast. Now that I have a sports watch I'm more aware of the numbers and I notice that while I'm sitting down I'm fine, HR around 70-90. When I get up to go to the kitchen my heart rate elevates to 114-117, I feel out of breath like I walked for a long time, now if I continue to walk my heart rate begins climbing up more and it reaches 130-140's and I'm more out of breath. I also experience palpitations like my heart beat a really strong beat, and I also get a sinking down sensation on my chest,like when you are on a roller coaster and you drop, or like a surprised/scared sensation in the chest. This doesn't happen every day maybe once or twice a month. I first I attributed it to being anemic, but now that I have that under control it's still happening. It's starting to worry me.