i do not think that your attack by killer bees triggered your allergy and sinus problems. a long term effect of a bee attack for me would be death (assuming i did not have my epi pen handy) but unless the bees resulted in permanent neurological damage -- something that you would have experienced soon after the attack -- then i don't feel there would be any long-term effects other than killer-bee phobia.
what are the long term effects of being stung by killer bees? . i was attacked by a swarm of killer bees in central america in 1999. i did not suffer from allergy/sinus problems until then. now i have allergy and sinus issues several times a year. could there be a connection or any other long term effects? it was severe enough for me to be hospitalized.