Final answer:
The symptoms may be caused by the drug bisphosphonates, commonly used to treat BMD issues, which can cause gastrointestinal and neuropsychiatric side effects.
Step-by-step explanation:
The symptoms described in the question, including diarrhea, anxiety, and confusion, may be caused by a drug called bisphosphonates. Bisphosphonates are commonly used to treat bone mineral density (BMD) issues. They have been associated with gastrointestinal side effects, such as diarrhea, as well as neuropsychiatric symptoms, including anxiety and confusion. The increase in dose a month ago may have contributed to the worsening of these symptoms. It is important for the patient to consult their healthcare provider for further evaluation and management.