I don't feel very well.
A: Hi, I don't feel very well. I may have caught a cold.
B: How long have you been feeling like this?
A: 3 days already.
I don't feel like eating anything.
A: How do you feel?
B: I don't feel like eating anything. I feel like vomiting.
A: How long has this been going on?
B: For one day.
I'm under the weather.
Both of my feet and hands ache all over.