Aren't you pushing yourself too much? If you are having a hard time, you can say so.
2. Aren't you forcing yourself too much? If you are having a hard time, you can say so.
「○○していない?」(確認を含むニュアンス)=Aren't you....?
「無理をする」= To push yourself. To force yourself.
「辛い時」= hard time.
「そのように言ってもいい」= you can say so.
また、文が現在進行形なので、動詞に "ing"を付けています。