Definitely don't feed it for the moment, Sharon. The flooding may or may not have damaged at least some of the roots, perhaps badly, but also the plant may be drooping as your water table is probably still high enough to be starving its deeper roots of oxygen. Either way, feeding it won't help. But anything you can do do help dry out the soil around it would be a big help - perhaps by digging a temporary drainage channel well clear of the plant, if you can.
