I read your question and I understand your concern. Occipital neuralgia however is not related to your nose bleed, their causes are not related at all. In a case of nose bleed the first reason to exclude would be very high blood pressure (which could have occipital headache mistakeable for occipital neuralgia). So if it happens again try to measure your blood pressure. Other possible reason could be fragile or some abnormal nasal blood vessel, nothing to panic but an ENT (ear-nose-throat) specialist visit would be recommended. Of course there are other rarer causes like blood coagulation disorders, certain drugs etc, but they are to be thought only after excluding these common options. Generally isolated nose bleed have benign reasons though, so shouldn t panic for this one time, but if repeated as I said check blood pressure and ENT evaluation. I hope to have been of help.