What is the best way to treat hay fever in a child

A couple of weeks ago my son was rubbing his eyes a lot and I assumed his eyes were sore from playing on the Nintendo too much.

The next day they looked extremely red and he was a bit sniffly.  It dawned on me he may have hay fever.  How does this happen?  Can anyone get hay fever at any time in their life?

Seeing as, due to Lockdown restrictions, we can't get to see our doctor at the moment as we are required to fill in a form online and submit photos and then wait until a doctor will either text or call (within 24 hours), I decided to pop into the chemist for advice instead.

Which reading the NHS website is the correct thing to do.

I told them of my son's symptoms, which seem to match some of the NHS Website symptoms, and they had a look at his eyes and confirmed he has hay fever and gave us some non-drowsy anti-histamines.

So now I am online looking for apps to tell me when the pollen count is high and reviewing data on how hay fever develops and if once you get it, you will always have it.

Do's from the NHS Website

Hay fever is an allergy!

The Allergy UK website has a host of information on hay fever

The NHS Website is a great place to start too.

So on warm sunny days, I need to check if the pollen count is high, chances are it will be.  The Allergy UK website also recommends not putting the washing out on high pollen count days, I hadn't thought of that, but that makes sense!

Finally, the Met office does have a page showing if the Pollen count is high.  I've also downloaded the App so I can see on any one day what the pollen count is doing.  

Are there any other websites or apps I should be checking or downloading?  This is all a bit new to me so any advice would be very welcome.