Stress

Its been a strange couple of days. Ive been completely exhausted-probably as a result of weeks of sleepless nights. Went out for a run on Sunday, but only clocked three and a half miles of the required seven. Not sure why I had a bad run, what the cause of the stress was. Although it was hotter than it usually is at that time of day, I dont think the heat was the cause, but it certainly played a part. Any self belief I had I have now lost, and im unsure how to get it back.