I got my rat fuzzi a couple months ago with his brother hopper. They were fine up until about 3 weeks ago. Fuzzi has been making a strange noise it is like guinea pig mixed with like a congested sound. He has these fits of it and I gave it some time thinking it would easily clear up because it wasn't bad. Now he is making that noise very often and when I pick him up he trembles like crazy until I calm him down. I'm getting very worried. He hasn't lost weight (infact he is rather chubby) or has discharge. Please help, any comment is appreciated.