My 78-year-old grandmother has been experiencing severe itching all over her body, but there are no visible rashes or redness. Due to this, she is unable to sleep properly. Previously, she was taking Reactine Plus tablets for joint pain, and now she is taking Ruma T Ayurvedic tablets. Recently, we consulted a dermatologist, who advised a blood test. The results showed low hemoglobin levels and increased creatinine (1.2). The dermatologist suggested visiting a physician for further evaluation. What could be the possible causes of her condition, and what should be our next steps?