SCH and WHM both have their perks, giving the perks of one class to the other would be a terrible idea. Having a shield would be awesome, but it will never happen for WHM, because that's not how the class is meant to work. In many situations SCH are arguably better, better MP management, less enmity, damage mitigation, and free heals from your pet. Your class isn't weak by any stretch, you just have to learn to play it to its full potential. I have both leveled to 50, i prefer WHM, but many perfer SCH, and there's nothing wrong with that. SCH and WHM are best when played with each other.

PS Whispering Dawn from Eos is a regen ability