Heart rate

I have been very easily fatigued this last week, and my heart rate has been uncomfortably high. It began spiking as high as 130 several days ago, but I was able to get it down into the 80's within about an hour with deep breathing and visualization. Last night it jumped to 100 and has stayed there despite my best efforts to relax and bring it down. I am staying still as much as possible and taking deep breaths, tho so far it has not been below 100. I have stayed off my adrenal and thyroid meds, so this is not a reaction to those. I will continue to monitor it, and go to the ER if necessary.