I get the racing pulse sometimes and have had anxiety in the past and am prone to it. When I went to give blood my pulse was so high they made me sit and wait. I asked what causes that and she said: Exertion, caffeine, anxiety could all contribute. I think at the time I checked all of the boxes, but in my experience, altering your hormone levels can certainly cause things like this. I agree though, you certainly want to get things checked out.