My chicken has many mites on it that wont go away. It seems to be getting weaker and act more sick. I sprayed some pyrethrin spray but the mites come back even after i sprayed the chicken and the coop. I am planning to give the chicken- human vitamins (childrens chewey vitamins) that are crushed and put in the water since I have no medicine for the chicken. Will that help? and how many? Thank you!