I’m under the weather.
I’m feeling run down.
I’m sick. or I’m ill.
I’m coming down with something.
I caught a cold.
I have a cold. or I have a virus. or I have the flu. (Notice you use ‘the’ with flu and ‘a’ with cold and virus.)
I have a headache.
My head is throbbing.
I have a stomach ache.
I just vomited. or I just threw up.
I can’t keep any food down.
I have a runny nose.
My nose is running.
I’m congested. or I’m stopped up.
I have fever. or I have a temperature.
My temperature is 104 degrees F.
I have chills.
I have aches and pains.
I feel faint.
Please leave me a comment if you have any questions about any of these expressions.