Causes. Headaches can be triggered by a variety of factors. The most common cause of headaches is prolonged tension or stress. These are called tension headaches or muscle-contraction headaches. Virtually everyone suffers from this at some time. Muscles in your scalp, neck, and face tighten and contract, causing spasms and pain.
Cat milk alternatives: If you want to give your cat milk, the safest bet is to purchase special lactose-free cat milk from your supermarket or pet store. Bear in mind that milk contains calories (water has none) so do keep it minimal. Obesity has serious health implications for cats.
Any amount of Vicodin can harm your cat. Cats and people have different systems. Human medicine, even on dose can destroy the liver or kidney function. Call an emergency vet and take the cat there. Don't give the cat milk as she will have other problems such as diarrhea. Milk is not good for cats. Give water to keep him hydrated. He must see a vet ASAP.