The symptoms of diabetes are: going for a wee a lot, especially at night, excessive thirst, losing weight without trying to, genital itching or thrush, slower healing, blurred eyesight, increased hunger. https://www.diabetes.org.uk/diabetes-the-basics/diabetes-symptoms
If you have diabetes, you should have regular health checks, at least annually, to make sure your diabetes is well controlled and to ensure you’re staying fit and well. https://www.diabetes.org.uk/guide-to-diabetes/managing-your-diabetes/care-to-expect