For your sleeping problems, maybe ask your parents to get you some melatonin to help you sleep if you don't use it already. It could help you sleep!
And yeah I agree math is boring, but it is necessary to study it to pass school so try your best!
About Hannah, it is most likely no one will notice, since people are oblivious haha. If anyone asks you about it though and you don't wanna tell them, just firmly say no.