I should probably explain a bit about Cashew’s history first: When he first adopted, he had a nasty eye infection, having been badly neglected in his previous “home”. He was at the vet within the first 48 hours of being home with us, and twice again that week, and several times in the next few months, and about 50% of it was eye issues.
His first vet visit was because he suddenly started sneezing up a storm. (It would have been that same day, regardless, because of the eye infection, but he arrived home late Saturday, and it was in the middle of the night Monday morning that he started sneezing so much he bounded up like he was trying to escape it)
The fear was he could have a blocked nose, which as we know, is a very dangerous thing for bunnies. (Like so many things 

)
As it happened, though, it was actually all to do with the eye infection. The vet said the eye irritation was causing his eye to water and there was a bit of backflow into his sinuses, which irritated them and caused him to sneeze.
It’s been over a year now, and I think we’re at about the level of baseline standard issue bunny-parent worry 

He has a tendency to eye crusties, and sneezes maybe once a week, lol. When I’ve called the vet they’ve told me to watch for any discharge from his nose or eye, especially if it’s white, and redness in his eyes. If I’m diligent about cleaning his eyes, it doesn’t get too bad or get stuck in his fur. But I think his latest batch of hay is a bit dustier than usual, so last night I used a little bit of ophthalmic saline solution to degunk the corners of his eyes. At first he seemed to like it (he usually does), but then he winced a bit and I thought perhaps his eyes were slightly irritated and the saline bothered them. His eyes aren’t red, just a bit gunkier than usual.
So then this morning, he sneezed, just one little double-sneeze, but it sounded squeakier than usual. Like a teeny high-pitched trumpet. I checked his nose, and I couldn’t see anything, but there was just under his nose a bit of what seemed like water in consistency, but was very very slightly sticky. (It was in fact a lot like his eyes when they water.)
I cleaned his nose just to be safe, with a damp cloth, and he seems fine. We cleaned his room to try to get rid of all the hay dust that accumulates so quickly. (We clean what feels like constantly, lol, but he likes to take hay with him into his hiding spots and bits of dust build up in things and around corners.)
My husband is calling the vet, but I imagine they’ll say what they said last time, and the time before: keep an eye on him, etc etc.
But it drives me crazy, because I’m always afraid this time it will actually be nasal congestion and we won’t know until the middle of the night when there’s no vets who will see him. (This came up one of the times his eye was infected: it was terribly swollen, and when I called the 24-hour vets around, each had a different reason why they wouldn’t see him…)
So what I *really* want to know is, what first aid measures should I take if that ever were to happen? Are there things I can have on hand that will help if ever his nose gets blocked or partially blocked and it obstructs his breathing?
And honestly if anyone else has experienced this kind of thing, watery eyes an occasional sneezing, it would be really great to hear from you! Thanks so much!