Code:
Health:SetStatusBarTexture(STATUSBAR)
I don't know what STATUSBAR is, presumably it contains a path to your status bar texture file.
Looking at the image in the original post though the statas bar texture looks to be just a solid orange square(rectangle). Flipping/Rotating that won't give you any visible difference.
Are you instead wanting the status bar to be taller than it is wide and fill from bottom to top?
Status bar orientation.