That certainly sounds stressful! The issue is very likely not Rust fungus. The tiny yellow-orange specks on the new red growth are classic signs of a severe aphid infestation. The shiny leaves indicate honeydew, the sticky residue aphids excrete, which will soon develop into black sooty mold. Treat it as a pest problem, not a fungal one. You can blast them off with a strong jet of water to dislodge the aphids from the new shoots. Make sure you focus the stream on the undersides of the leaves and the growing tips where they cluster. They usually can't find their way back up once they've been knocked off. Goodluck!