Thanks for asking the query,
According to your clinical history is suppose that you are having a deep cervical abrasion
or gingival recession
causing root exposure.
I would suggest you to visit the Dentist
and get the thorough checkup done.
Application of cavity varnish can give you relief to some extent.
Use a desensitizing toothpaste along with a soft bristle toothbrush.
Go for complete mouth scaling and polishing.
Use antiseptic mouthwash gargles twice daily.
Hope this helps out.