My baby (about 4 or 5 months old) black sex link contracted gape worm - the typical stretching out of the neck for breath and crackling sound in her throat. I've dosed her three times in as many weeks with Safeguard at the pea size dose recommended on this site. She gets better and at one point even stopped the gasping for air but this morning, she was doing it again. Crackling sound is back too. I'm frustrated and out of ideas. The whole worming thing is a crap shoot - try this, try that - none of it is labeled for poultry. Please help me save this little girl.