i dont think there is a illness that wont respond to good quality wheatgrass.
as for blending i have done this and think it works ok if you have a good blender. but it is definitely not as affective as juicing
it with a quality juicer. the fiber in grass is very strong and no matter how much you blend it, some of the juice stays trapped in there. cows digest grass in several stomachs over a long period of time, this is why they can eat it. we only have one stomach, thats why its best to chew the grass thoroughly or juice the grass.
but the blending method is useful and will certainly give you some good results.
try adding some chewing to your blending. just take the nicest looking blades of grass and chew on them. its great for the teeth.