I awoke from a nightmare last night and realized that I had a rapid heart rate.  I also experienced the need to use the restroom, which resulted in diarrhea. Can this be considered to be a normal occurrence as this has happened before?  I have had all the tests for heat condition, which were normal.
Hi, Welcome. This is Chat Doctor. The condition you are telling seems abnormal i.e. Palpitation, tachycardia followed by diarrhea. This type of scenario generally occurs in an arrhythmia called as supra ventricular tachycardia. So you need to evaluate it further. If all the heart tests have been done, then it's fine, but I'll still recommend you for a 24hr ECG monitoring called as Holder Monitoring. This may catch any abnormal palpitation if that occurs in that 24hr period. Otherwise, there are additional tests called ELR(Elective Loop Recorder) which can be put for 7 days or a month for ECG monitoring. Come back if you need any more help. Thanks