sore vagina walls!

I've woken up a few times with really sore vagina walls?
It aches.
I'm not sexually active.
It feels like I've had hard painful sex.
It really aches and I have no idea what to do?
It's not a UTI either?
I've been tested before and it was negative.
I'm just wondering if there's and other causes or things to be worried about ?
TIA

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