Hi, It sounds like you are experiencing several concerning symptoms, and it s important to seek medical attention as soon as possible. The black stool you are experiencing could be a sign of bleeding in the upper gastrointestinal tract, which could be related to a number of conditions including ulcers, gastritis, or even something more serious like cancer. It s important to have this evaluated by a healthcare provider as soon as possible. Additionally, it s concerning that you have been experiencing stomach pain for several months and were recently diagnosed with polycystic ovary syndrome (PCOS). PCOS can cause irregular periods, but it s important to rule out other potential causes for your missed period and anal bleeding. I strongly recommend that you schedule an appointment with your healthcare provider or a gynecologist for a thorough evaluation. They may order additional tests, such as blood tests, a colonoscopy, or an upper endoscopy, to determine the cause of your symptoms and provide appropriate treatment. Don t delay seeking medical attention, as early diagnosis and treatment can improve outcomes. Take care. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Diwashish Biswas, Internal Medicine Specialist