I have a <1 year old hen (Iris) who has been stretching her neck as though gasping for air for a couple of days. I treated her with oral suspension of valbazen last night and she is still gasping 24 hours later. I know she's tired 'cause it's keeping her awake. She drinks water, but today isn't very interested in food. If anyone else has experience like this, how quickly did the valbazen work to kill worms (I suspect gapeworms)? None of the other chickens are affected. I have her in a little carrier/pen, but she's starting to look really lonely and depressed so I moved the pen into the entry of the coop. Thanks for any advice.