What should you do now?
If your proposal doesn't win support, keep calm. Never berate funding officials or grant reviewers. Try to get more information, and ask whether it would be worth submitting another application in the future. Go back over your proposal with care, and see if you can find places where it might have been stronger. Try to think of the reviews as free consulting. The chance of getting funded is better the second time around.
Sometimes funding agencies simply do not have enough money to fund all qualified proposals. In this case, you might consider resubmitting your proposal for the next funding cycle. Most program officers invite you to contact them and discuss the review results. Also, consider looking for additional funding sources. Your proposal may need only minor changes before being submitted to a different foundation or funding agency.