I set about seeing if there was anything which could provide even more of an anti-histamine effect over just the nasal wash out method described above. I was wary of taking anti-histamine drugs, because I'd read these might make things worse with long term usage. Being an afficinado of the use of light for medical problems, I did some more research and discovered there are little red light - or even infrared - gadgets which you can stick up your nose to create anti-histamine effects, and that this idea was based on sound science!