Yeah, hayfever gets me as well
Antihistamines do help some people, and you can get it over the counter without a prescription. Just need to be careful of interactions if you're taking any other medications, doctors can prescribe something stronger if your hayfever is really bad though
If not, there are nasal sprays and eye sprays if you have sneezing and/or itchy eyes. Sometimes a cold flannel or towel placed across closed eyes can help soothe them. Depending on where you live and how lockdown is, you may want to try and avoid being outside for too long on days where the pollen count is very high unless you really have to be
Stay safe <3