Rhinitis Treatment Care

due to severe hay fever and heatstroke + exhaustion i have been really unwell this week and missed my science year 10 gcse – which might i add i didn’t even know i had! how do i get a doctors note as proof if they don’t issue them to minors and you have to pay quite a lot of money for them; i don’t know if my parents could afford it as it is £25 + to pay for the science exam alone.