Acupuncture treatment can actually help to maintain the blood pressure by balancing the body. In Chinese medicine, we consider hypertension is imbalance between yin and yang of liver and kidney. Acupuncture can balance it by stimulate certain points, also release the stress or emotional reasons that may elevated the blood press.
For diabetes, from western medicine, body has trouble produce insulin, so it will be treated adding insulin to the body to help with glucose metabolism, for Chinese medicine, diabetes is mostly caused by imbalance of yin and yang, we use acupuncture and herbs to try to balance the body to help the insulin producing and faster the glucose metabolism.
Taking acupuncture treatments is like keeping energy flow smoothly, general stress in Chinese medicine is more liver qi stagnation, therefor, taking acupuncture regularly to keep liver qi flow nicely. it's advisable.