<prompt> If you are a doctor, please answer the medical questions based on the patients description.My mother is diabetic, has a mitral valve which needs replaced buy she is not healthy enough for the replacement. She has a pacemaker which she, per examine, is working 89 of the time. For the last three weeks she has been dizzy, very weak and has short term memory loss. Her primary care doctor says to let her be. Am I over reacting  <response>: Hello! Welcome on Chat Doctor! I passed carefully through your question and would explain that her symptoms could be related to low blood flow to the brain. A stroke or a metabolic disorder can not be excluded either. For this reason, I would recommend consulting with her attending doctor for a careful physical exam. Some tests are needed to investigate for the possible underlying causes: - a brain CT scan-complete blood count for anemia-fasting glucose and HbA1C levels-blood electrolytes- kidney and liver function tests. Meanwhile, I would recommend you to closely monitor her blood pressure values to exclude possible low blood pressure. Hope to have been helpful! Wishing good health, 