i think that your plant is dying, and you might not be able to save it.
if it was my plant here is what i would do.
using a new single edged razor blade, cut the flower spikes off about an inch above the crown.
pull the plant out of the media and inspect the roots. if there are some healthy roots (they would be whitish or greenish, possibly brownish and somewhat firm) then i would try to save it.
if they are brown,black and mushy and slimy i would expect that there was almost no hope.
i would still try. then cut the dead roots off o using a new single edged razor blades. 