Like duhhhh
I do that too since my parents (just mom actually) worried too much i think it wasting money and yes i mean i know they care (not to how i feel though)
So when i having something like an cold or fever (though my body tired af) i alway go to school and do everything like normal then after some few days it will just be gone although i did try to express that i am having some hard times but they never not even once notice, i guess they don't care that much since even if i did so but if they don't notice then they will keep made me do the chores (i am fine doing chores but they can't even ask me nicely like "honey can you sweep the house for me please...", what i got insteed are alway "GO CLEAN THE DAMN HOUSE",...blah blah...#－.－)
When I have a fever or a headache I just tough it out and pretend to my family like everything is normal one time we were cleaning all day and I had the worst headache ever#－.－)(๑•ㅂ•)و✧