I have a headache, but I have to go to work…
If I were you, I would take a day off.
（If I were you, I would 仕事を休むね）
If I were you, I would …「自分だったら、〜する」
I’m getting fat…
If I were you, I would cut carbs and start running every morning.
I have a week day off!
If I were you, I would go to Disneyland and DisneySea.