PS.
Yellow could be nitrogen, iron, sulfer, copper issues,
brown could be calcium, mag, boron, manganese, phosphorus issues
leaves drooping could be root rot, lack of water, over water, heat, stress or other issues
All of this can happen pretty easy if you are not properly PHing your water, check the run off too this can help you in stabilizing your plant so you can better understand the problems that need addressing without having new ones pop up.
look at the link see the pictures and narrow it down to what YOU think it is, then post some pictures with what you are thinking and see what kind of responses you get then.... might work in saving your girl!