My beautiful one and a half year old light Sussex chook Esmeralda showed signs this morning that she had gapeworm (gaping a lot, making weird noises) but she seems bright and happy. This afternoon I looked at her and she had a bluish comb which I thought is a sign of lack of air and she seemed very uncomfortable with her crop. This morning I researched and then felt her crop which was squishy, like sour crop was described. I had a one - two year old chook 4 years ago that we think died from gapeworm. Suggestions or treatments? Thanks!