Thanks for sharing your concern.
According to your history, your impacted third molar is causing pressure on other teeth.
As you have already got the x ray
done,showing no decay,then definitely, it is your third molar causing pain and infection.
Due to its location, it becomes difficult to clean that area,therefore i would advise you to do warm saline rinse after each meal so that food debris do not get accumulated there.
In this case, you can wait and watch for a week more and revisit your dentist
for clinical evaluation.
what did your dentist say?Is there enough space in the jaw for the third molar to erupt comfortably?
If not, then it is better to get that extracted,to prevent recurrent infections.(pericoronitis
For pain you can take painkillers after consultation.
Hope it helps.