Had the same thing.....started in 2001 whilst eating a chilli con carne after a Sting concert in Germany (totally irrelevant).
It was hell for six months until I started taking loratadine tablets, one a day AND Beconaise spray, one puff in each nostril once a day.
For me, I had to take both, miss one or the other and it all kicked off again.
Turns out i am allergic to myself.....cortisol was the root cause.