thanks for giving complete dental history.
after going through it i have realized that yes it is true. your problem lies with your impacted third molar.which requires dentist
now i would say get it extracted immediately only if it is causing more discomfort to you else you can wait for some more time.
now also try and understand that third molar is neither functionally nor cosmetically desirable,but still if you want retention of that tooth,then the choice is yours.
have you checked with your dentist how exactly that tooth is lying in your mouth ? i mean vertically or horizntally?is it affecting any roots of your adjacent teeth?
these are the reasons for which a dentist stress
upon extraction of 3rd molar.i wish everything remains normal in your case and then after cosulting your dentist you can postpone your extraction for some time.
meanwhile visit your dentist once with your old xrays,take good nutritious diet.and maintain good oral hygiene