My rabbit sneezed a bit when I first got her because she wasn’t used to the bedding. I didn’t know that though until I took her to the vet. If you’re using bedding, you could consider switching it out or getting rid of it altogether. You could also try dusting the room your bun is in, and vacuuming.
Rabbits make noise when they are sick, angry/scared/territorial, or happy. Honking is a happy sound, and can be made when a rabbit is hormonal, or when a rabbit is happy to be eating or pet. Snorting is anger/fear/territorial behavior, and means “stay away” or “I don’t like that”. My rabbit can make little squeaky sounds. She is a lop ear, and has bad hearing, so I don’t think she knows she’s doing it. She usually does it when she’s happy. The context of your rabbit’s actions means a lot. Think of how the environment has changed to make them act a certain way, or what other signals they are giving (body language, signs of sickness, etc.) when they make a new noise.
You can’t be sure something is not wrong unless you get your bun checked by a professional. I would suggest taking either public transit, or sharing a car with your husband until you can afford to get the tire on your car fixed. This way, you might be able to get your bun to the vet sooner.