is it crop related illness or something else?

[sarahuk]

My hen had sour crop over a month ago and we took her to the vets to flush it. All successful and she was on antibiotics for 5 days. Once this course had finished the same thing happened again, a repeat trip to the vets and another course of antibiotics, this time for 2 weeks. However about a week in to the anti-b's the hen started to appear ill again but didn't have to the blocked crop. Hunched up, not moving much and not eating or drinking much and her crest has gone really pale. Ive stopped the anti-b's as feared it could be them. There has been no improvement and she has lost an awful amount of weight. Ive started feeding her soaked bread which she is eating small amounts of and have read on here about the yog and egg which i am going to try tonight.

I would be extremely grateful for any thoughts on what the problem could be and anything i can do to help her. Thanks