I have a contact headache and peeing a lot. feeling tired and lethargic ?

We need more details. A constant headache is a concern that may need emergency attention. Based on limited information putting these together I wonder if you have a pituitary tumor. There are many other reasons for your symptoms. See a doctor

Diabetes? Go to uptodate.com, and read more. Keep a peeing diary-when and how much each time is passed. Use Cronometer to entry how much and what you eat and drink. Check with a clinic and review diary and Cronometer.

Agree with Drs. R and G. It is not feasible to provide a meaningful opinion without additional history, physical examination and may be some tests. Diabetes needs to be excluded. It would be prudent to see a doctor. Wish you good health!