Hello,
I’m not sure how much insight I can offer you since I am a new bunny mom. At the vet, they will look at your bunny’s teeth and feel your bunny’s belly to make sure it is healthy. When I took my bun to two different vets for sneezing, they did a culture on the discharge from my baby’s nose. It’s true that some bunny’s can have “sensitivities” to hay. Sneezing caused by hay is usually caused by the hay being too “dusty”. (Dusty hay makes my bun sneeze like crazy so I try to filter out as much dust as I can). My bunny is also sensitive to certain kinds of bedding, like woodchips, for example. So now I use the hypoallergenic kind of bedding (I got it at walmart for very cheap. It’s all multi-colored, contains no dust, and is marked on the package as being hypoallergenic). As for allergies to plastic and metal, I’ve never heard of that.
Poor bunny
I know you said you have never noticed a runny nose. That’s good that your bunny cleans his nose, but the fact that he does it often could mean he’s cleaning it often for a good reason– to clean off any discharge– which bunnies will do. The vet will check the front paws of your bun for any sign of matting or discharge (which gets stuck to the paws due to frequent “cleanings”).
I wish your bunny the best! Let me know how it all pans out with the vet! It’s always better to be safe. I don’t think you’re being overprotective at all. It’s important to keep an eye out for signs that bunnies may be sick. Since they are prey animals, they tend to be sick “quietly”. They don’t want to showcase their illness as a natural instinct to protect themselves. Please feel free to let me know what the vet says! God bless your sneezy bunny!
-Taija