I have a cow about 10 yrs old and under her jaws it looks like a build up of fluid, it is all puffed out and floopy like it is filled with water, she also has diarrhea, it is pure water, she has had no grain and there isn't much green grass yet either. all she has had is fescue and orchard grass mixed hay and the trace mineral salt block. any help on what to do for her, she has lost alot of weight as well. Thanks for any help given