Healthy cow ,sick the next day. Temp 103-104 not eating or chewing cud. Watery brown stool,swollen lymph gland under throat,very depressed. Lungs a little raspy, breathing heavy. The vet treated her w/ banamine,nuflor and vit-b. Took blood and stool sample to send to lab.She ate hay later and grass and the next day pretty much back to normal and better each day. I think she ate some weed that made her ill. The only unusual weed I found was black nightshade.Any ideas?