I take Loratadine, you can get it at Lidl for about a quid a pack, you have to take them regularly before they take effect, my Mrs takes them as well because she is affected badly by insect bites. Back as a kid in the 70's I had tests for allergies, scratch test on my back, found out I was allergic to dust & dust mites , dogs cats birds, tree & grass pollen (tree pollen is a nasty one) and with this information I was put on a course of injections, 2 a week for 6 months. All was fine for a few years but it eventually came back (though my asthma went and never came back). Now it could be severe one year and nothing the next. Evenings are worse as tree pollen stays high in the air during the heat of the day and settles as it cools.