Welcome to health care magic forum.
Pain sensation on tongue can be due too depapillation as well due to lesions of oral submucous fibrotic bands.
I would suggest you to avoid spicy foods,betel nut or tobacco chewing
Maintain oral hygiene
Floss your tongue daily.
I would suggest you to take nutritious diet.
as well as vitamin B complex supplements are administered in such cases.
Hope this helps.
I wish you good health.