have used their hypo-thyroid one to great effect, and tapered down to once every few days from the rec dose after a few months.

nux vomica from boiron, one round pellet crushed between two spoons, sprinkled on wet food, definitely helps my champon vomit-hurler cat. (the ear in upper left on icon)

not a full solution, but you might try camomile, a drop or two mixed in wet food, for his evening meal?

you might also contact the website and see if they have a local distributor? I haven't seen it in stores, but I suspect it'd be at more herb-specific stores, rather than the hippy groceries that I normally haunt :)