I have four chickens who have been sick for a while now. I have spent a ton of money on different medications(flagyl, fenbendazole,and antibiodic injections)vet appts, with little to no improvement. The way it would seem is gape worm, as well as giardia. Symptoms between all four chickens include the following: episodes of pale come and lethargic, shaking of head, arching neck, and bloody stools. I beg you to please help if you can, these aren't just regular chickens, their beloved pets. Thank you so much.