After repotting and fertilizing a gardenia plant the leaves are drying out and the whole plant appears to be dying is it possible to save it?

the planting substrute you used may be too dry to absorb water. take the pot and place it in a big bowl of water with the water about a cm below the edge of the potted plant. keep it over night and see if it helps. if it does remove it from the water and start watering normaly.