these seem to be enlarged salivary glands.
you were told to drink lots of water so that if there is any stone in salivary duct from where the saliva from the salivary glands reach the mouth , will get washed out easily.
Now it seems you are not getting relief out of it.
you can eat citrus foods so that the salivary flow increases and the stone which might be obstructing moves ahead.
If not relieved the ultimate treatment is surgical removal of stone if possible or the gland .
If you have enlarged glands and have pain and fever
with it .you can take---
300mg twice daily this will decrease the infection if present in the glands .
forte three times a day this will help in removing the blockage .
Pain killers sos (if required)
gargle 2 tsf in half glass of water for gargle 3 times a day.
follow up after 5 days.