8 year olds BP was 94/62 (within medical limits) but not within his normal limits. Doc says nothing about it. Am I worrying too much?

Yes. For an 8 year old, a blood pressure of 94/62 can be normal. Blood pressure reading is a relative value which is directly related to the health status of the patient, body habitus, age, sex, ethnic background, medical condition, eating habits/food consumption, stress level, and genetic propensity. Example, a blood pressure of 94/62 on a person like "andre the giant" would be considered low.