Hi,
New to list & hope you've sorted this out by now, but seeing as you got no replies previously...
With regard to your worries about catching him, sounds like the best idea is to find someone experienced & gentle with horses to catch him & teach you how to get him to come to you & handle him safely.
With regard to the cribbing, it is one of those habits that is near impossible to break. Usually brought about through stress of an unhealthy environment & feeding practice, such as show/stabled horses are often subjected. There is a big chance he's got stomach ulcers too, because of previous management practices.
As for his obvious general stress, perhaps at least temporarily, you should remove him to a paddock with some easy going horses, or only one other, so he can pal up & feel secure. I'd also try herbs or flower essence to help calm him.
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