I think after taking antibiotics the throat infection
must have gone.
Now the pain you are feeling it can be because of this lump which is present on your soft palate
and below the tongue. This lump can be an aphthous ulcer for this you just have to apply a topical ointment named mucopain and wait for 1 week. If it heals within this time there is nothing to worry.
If it still persists after that then you should visit your E.N.T. Surgeon.
Hope it will help you.