Jane, the Women's Tear Stimulation may take several hours. If you need relief immediately, use eye drops. Take the WTS so you won't need to use drops so often in the future. Natural Ophthalmics also has a product called Total Ocular Function that they recommend using along with their other products. TOF is sprayed in your mouth -- very easy --and I've found it to be effective. They feel that gastric acids deplete the eye vitamins and that an oral spray is a better delivery method.
I order from PureFormulas.com and have been happy with them. They're in Miami, but I get 2-day shipping free.
I hope you find something that helps you.