Whole right side of face/neck swollen because of tooth decay?

Hi: Your question sounds painful ! You have endured enough at this point, I am not a dentist but there is a definite ongoing* abcess there and the mere fact that you have swelling, well ship yourself off to your dentist, do not postpone, as something serious is ongoing, perhaps, blood poisoning due to infections.Been too long now..Help yourself to feel better Good Luck ! ps: you can try 50/50 solution of salt water for a mouth wash, providing you are not* on a salt restricted diet.