Unable to urinate

Drink more water and try some 100% natural cranberry juice (make sure it doesn't say cocktail on it).

When you feel the urge to urinate and nothing comes out, that is a sign of a bladder or urinary tract infection. If this symptom continues, I would go see a doctor.

If you want to urinate but you cannot, it maybe a kidney stone which block the urine flow.

Do not drink anymore nor eat because you can damage your kidneys or bladder. Lie down and wait.

If the cork doesn't want to evacuateyou can dissolve this stone by following a natural cure to drain the surplus out of your kidneys.
An urologist can also help you.

Good luck