What had your doctor suggested you do? I am new to all this and sure others are better at advice..but I think you need to find out exactly what it is-it may be best to return to the doctor and explain what is wrong, he may suggest you go on a 10 day heart monitor. I had at first gone on a 24 hour, the doctor told me, I was fine..but it wasn't till I went for a second opinion that he had put me on a 10 day and it was able to pick up a few things. I can tell you thru all this what has helped me greatly was the Valsa maneuver, also lay on the ground with your legs up the wall, for a good twenty minutes. When I am having an episode, this really helps me a lot.
Also the last week, I have been getting into essential oils. Lavender and Bergamot, I sniff and it helps with the anxiety. Calming lotions also help.