My rat got a lower respiratory tract infection, he is being treated with antibiotics for more than a month and yesterday he took an injection wich was supposed to substitute the last doses (since having to give it to him orally was stressing him). But since yesterday his breathing is gotten worse, he is gasping and having to make a lot of effort to breathe. One time it even looked like he stopped breathing. My vet is saying we should wait to see if he gets better, but he doesn't seem to. What do you guys think I should do? Is there anything more I could do?