Oh my, that just makes me so sad to hear what a terrible time you are having. You are doing all the right things to prevent pollen contact, but there might be some additional things on my blog you have not thought of. I also have a lot of ideas about histamine sensitivity regarding foods, nutritional advice etc. Please go to
http://dreamingabeautifulworld.blogspot.com/2018/03/hay-fever-what-how-and-why-part-i.html which is the first part of 4 blogs written this last month for people with hay fever. I would write more here, but I have been answering permies.com questions all day and along with my regular work, I am too worn out to write much more tonight. So, I hope you don't mind me sending you over to my blog. The information is extensive and will take time to read, but perhaps there is some pearl in there that you have not yet considered.
One thing I might add here, that is not on my blog, and you may not have heard of is the use of red light.
Shining a red light up your nose can increase blood flow circulation, reduce histamine production and calm inflammation. Lloyds pharmacy has created a phototherapy probe that’s found to alleviate sneezing, a runny nose, watery eyes and an itchy mouth. They can be purchased at
http://www.lloydspharmacy.com/en/lloydspharmacy-allergy-reliever This is also an interesting light therapy place to check out but very spendy:
http://vielight.com/devices/
Immunotherapy is also used and not listed on my blog. You work with a specialist to slowly introduce small amounts of pollen to your system to build up resistance. The treatment can be given as an injection or a tablet that dissolves under your tongue, but is reserved for severe cases and can take months to have any effect. However, for some people this is magical.
Most everything else is on the blog. I have not added the 4 part yet, which is about herbs and is only half finished. I am trying to get it done and will post it on the blog very soon.
After you read the blog, if you have additional questions, please feel free to recontact me.