Thanks for writing your query,
hi and welcome,
After reading your history i suspect the gum overlying your wisdom tooth is inflammed with pain and sensitivity, this condition is called as pericoronitis
Wisdom tooth is the last tooth to erupt in oral cavity as the area is difficult to clean and often susceptible to infection and pus formation.
As you have mentioned white discharge is the abscess coming from gum pocket.
I would suggest you to maintain good oral hygiene
using antiseptic mouthwash like betadine
and keep the area clean to prevent further damage.
If this doesnt help , you need to visit a dentist
and get the gum pocket excised surgically to remove the infection and encourage eruption of wisdom tooth, this is called as operculectomy.
i hope this helps,