Here's another article that mentions
high morning blood pressure as a symptom of overtraining:
"
Physically, a person suffering from overtraining may have elevated blood pressure in the morning, and the rate of their pulse when walking might also elevate. This can alter the way that the person’s central nervous, immune and endocrine systems work. Someone who overtrains may feel tired all of the time and feel a loss of strength. The person may suffer from headaches, and feel tremors in muscles. A victim can get sick easier with the flu or colds, and deal with getting infections easier than before. Someone’s muscles and joints can ache, and they may suffer from feeling stiff."