Diabetes is a well known disease which needs to be controlled. There is no such thing as psychological diabetes. Stress is one of the factors which may worsen diabetes, but the important thing is to achieve overall control of diabetes.
Polyuria means passing urine frequently. It is a symptom of diabetes mellitus, diabetes insipidus, urinary tract infection, etc.
From the information provided, it is very clear that you are quite obese. You need to reduce weight by means of adjusting your food intake and by regular exercise. Weight reduction will help control your diabetes also.