Hi, sorry to hear about your Lab, I have a pug with the condition, and after the second bout I took advice from Denes (they have a very good web site) Pearl the pug is now on a low fat diet, and has a homeopathic drops when she has eaten a 'NO NO' food, which is anything fatty, and a herbal suppliment sprinkled on her meal.every day. Touch wood she has been fine. Denes has a vet on e mail who can answer queries. I have found that food little and often helps, Pearl has 3 small meals a day, and a small treat at bed time of a Burns Kelpie biscuit.
We try to keep all other food out of her way, and things like the chicken food are behind fences, sounds a pain but the condition is a killer and worth trying to guard against.
Hope this helps