Well there are a number of things it could be, and it's going to be hard for anyone to give advice without more details at least. The symptoms your rabbit has can be caused from anything from allergies or irritations, to infections (bacterial, fungal), to things like nasal tumors. Even if someone can guess at what it is, he may need antibiodics or other medical treatment to get better so I'd still really recommend that you try to find a rabbit vet you can get too. It's always good to have one on hand for the future too, in case of emergencies.
Is the discharge just from his nose, or does he have some coming from his eyes as well? What color is it? Is he healthy other then the sneezing and discharge?
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