Hi..
Welcome to HCM..
As per your complain there is inflammation of gum flap around your last molar tooth that seems to be probably wisdom tooth and the gum flap around it is inflamed leading to
PERICORONITIS..
Pain in ear and throat and ear is
radiating pain from the site of inflammation..
It is causing inflammation in throat and it is leading to painful swallowing..
I would suggest you to consult an Oral Physician and get evaluated and a thorough clinical evaluation and investigation like
x ray can help in diagnosis and treatment can be done accordingly..
In case if the wisdom tooth is impacted and will not completely erupt due to lack of space or obstruction with jaw bone then in that case removal of the wisdom tooth is the permanent solution..
In case if wisdom tooth is not impacted then the gum flap will be removed by a minor surgical procedure to relieve the symptoms and will be followed by antibiotics and painkillers..
As of now you should start doing warm saline gargles..
Take anti-inflammatory painkillers like
Ibuprofen..
Gargle with antiseptic mouthwash..
You should avoid any food accumulation in that area that can further flare up the infection..
Hope this helps..
Regards.