Toothache vs. a Toothache

[Ramya]

I find the following in your site:

"... a toothache..." Is it possible to use 'a' before toothache?
"... suffering from a terrible toothache..."

This sounds and seems to be right. But still I feel the first one to be wrong. Can you please explain this?

[Mister Micawber]

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Toothache can be considered countable or uncountable, but in my neck of the woods, the countable form is the standard: I have a terrible toothache.
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Native English teacher at Mister Micawber's