I was at work today (factory) and since i ste lunch, my heart rate stayed between 120-130 (usually it's 100 when I'm working) i tried taking 1mg of Xanax but it didn't help at all

I wasn't anxious about anything, is there something like subconsciously being anxious? Like you don't feel anxious, but your body/mind do, thus resulting in an elevated heart rate that lasts for hours 

Now that I'm laying on the couch my heart rate is 68