Question: what to say to someone not feeling well?
Answer: "I don't feel well." "I am feeling sick." ... 
"I am feeling very tired today." "I have been feeling very run-down lately." ... 
"I have a bad headache." "I have a sore arm." ... 
"I'm sorry you're not feeling well. Maybe you should go home to bed?" ... 
"I'm still not feeling well."