Sorry to hear bout that ,How does it effect him, he's got to that age with it , will you not get a few more years out of him,?
when his heart beat rises he nearly chokes to death and he vomits i dont know much about the dog i rescued him a month ago cos he was covered in mange and underweight friends of mine that knows the dog says he never had any trouble when he was younger i think he developed it when he was being mistreated