Here repotting in a sterile potting media will be necessary no matter which it is. Dont use standard houseplant fertilizer. Orchid leaves wilt and droop because of a watering problem. If your orchid is outside leaves or other foliage from surrounding plants or trees might be providing too much shade. At the same time the mix should be loose and provide oxygen to the roots.
This may be caused by overwatering underwatering excessive cold or heat old or unsuitable growing medium or even rot. Cattleyas last about two weeks if that. Any time you see orchid leaves drooping you should know that youre dealing with a watering issue. Wilting leaves are a worry but its not a sign that your orchid is beyond revival. Orchid leaves could also droop if the plant loses its roots.