Brinjal flower wilted & dropped off!

Oh dear, the brinjal flower wilted and then dropped off! Think it was not pollinated, that's why. I googled last night and it seems that they need to be pollinated by the bees - the bees flapping wings will release the pollens. To do hand pollination, one can try a vibrating toothbrush. I will try this method when the next one flower again... Bees are nowhere found in the plot so I gotta do hand pollination... hopefully it will work.... so sad that it did not turn into a fruit.