Definitely try worming. One of mine was miserable, laying eggs with virtually no shell etc etc, plus sloppy poos. My local farmers shop reckoned on worms. Although I'd wormed them with Flubenvet (brilliant stuff but expensive) earlier this year and not due to do it again until July, I wormed again a week ago - fantastic, within 3 days she was much better and laying fine. As obviously a worm infestation, I will do the recommended and worm again in three weeks.