I have an irregular pulse but it's been investigated in the past and no problem found. Was under a huge amount of stress a couple of weeks ago and bp and pulse rate shot up. The stress has subsided but my resting heartrate has dropped to around 52 and I feel quite tired and weak. I'm a 67 year old woman, slightly overweight, no bp problem. Doctor gave me Atenolol last summer to take to slow it down but haven't taken them for months. Could this be left over reaction to stress or should I hot foot it to the doctor.