Hello,
You should immediately visit your dentist who did the extraction.
It seems to be "Dry Socket". Don't worry, a palliative dressing will solve your problem.
You should take some precautions; don't take stress, avoid excessive exertion, don't consume alcohol or tobacco products.
Mouthwash is just an adjunctive to your oral hygiene care which is compromised because of extraction. You can continue using it till you are able to properly brush your teeth. But be sue your mouthwash does not contain any allergic,irritating components and alcohol in it.