I’m 38 Year Old Female. I Suffer From Stress And

I’m 38 year old female. I suffer from stress and anxiety at times. I’ve also had palpitations occasionally. Now I notice that they are more frequent when I’m very stressed. Which would be often now days. I had two EKGs done within the last year that was normal. I sent into my doctor’s office 11/03/2014 with a racing heart. I’ve experienced that a few times within the last week so that’s what sent me in. At night I feel heart palpitations as well. When I went to the doctor Monday, they did an EKG and said that the spaces was a tad larger on this EKG then the other EKG. They said this sometimes occurs with early 40 years olds but this was not the case three months ago. They said it could be nothing at all and don’t expect anything to turn up but why would my EKG be slightly different within 3 months from each other? What could this mean? I’m 511 weight 178. I don’t smoke at all but drink red wine occasionally. I also take blood pressure meds. I will be fitted for a monitor on 11/10/2014 to see if anything is found there. Please help with some ansers.