Healthy Pigs DO NOT make hacking sounds or any sound at all while they are eating or drinking or pooing.
Antibiotics are not going to hurt your pig if she doesn't have a URI. The vet prescribed them so that they could RULE OUT the URI. If it's not a URI, then the AB's won't help the sounds and it's something else. If the vet prescribed an AB, it means that something is wrong.
It's the way dr.s work. They start with the most common thing, and then try to rule them out before going to the next thing. If you were prescribed an AB you need to get good veterinary advice. For example: you need to make sure your vet gave you the proper kind of AB as some are deadly to
GP's. Guinea Lynx is the best place on the web
Bar None to get it. They have
cavy specialists who are vet techs and many others who have plenty of experience and know what questions to ask you.