Usage of article 'a'

[Barman]

Is the indefinite article 'a' used before the following words? Are they all grammatically correct?

1) A sore throat.
2) A headache.
3) A stomachache.
4) A toothache.
5) A backache.
6) A fever.

For example,

A) I was suffering from a fever/ sore throat/ headache/ stomachache/ toothache/ backache/ fever for a few days.

[Rover_KE]

In my experience (British English) stomach ache, backache and toothache are more usually used without the article.

Our North American friends will give us their opinions when they wake up in an hour or two.

[PeterCW]

In my experience (British English) stomach ache, backache and toothache are more usually used without the article.

That is my experience as well.

[GoesStation]

All the examples are natural in American English. We don't often use any of those malady names without the indefinite article.

[Barman]

In case of 'few days', which is correct?

a) ......suffering from a few days.

b) ......suffering from few days.

[tzfujimino]

"... for a few days" is correct.

[Rover_KE]

Always write a full sentence.

[GoesStation]

In case of With respect to 'few days', which is correct?

a) ......suffering from a few days.

b) ......suffering from few days.

Neither one works. Are you thinking of someone suffering from something for a few days?

[emsr2d2]

In case of 'few days', which is correct?

a) ......suffering from a few days.

b) ......suffering from few days.

You can't suffer from "a few days" or "few days". That sounds as if the few days were causing you to suffer.

[Barman]

Are you thinking of someone suffering from something for a few days?

Yes.