My chickens have gotten worse, two dose intervals of tylan 50, and one of sulmet! I'm looking into getting di-methox. I found some for thirty dollars a gallon! So it's easier on my pocket, I already have over 35 dollars of meds in these birds, for nothing! And now some of the faces are so swollen, their eyes are shutting!!!! =( I don't know what to do!!!!!!!!!!