Thank you very much.
The most common cause for this kind of swelling which gives you pain and soreness is a BOIL.
It is a staphylococcal infection involving the hair follicles with in the nose.
Some times this settle down by itself, but most of the times especially when it is large (like you mentioned) and old (as in your case), a course of antibiotics and anti-inflammatory medications is required.
Other less common causes for this include a cyst, or a tumor.
You should have this evaluated ASAP by your doctor in terms of a comprehensive clinical examination which will direct a specific and targeted management plan.
Keep your nose clean.
Avoid any manipulation of the swelling with your fingers.
Take Motrin or Aleve (available over the counter) for reducing pain and inflammation.
And proceed further for a detailed assessment by your doctor.
I would have been worried too if i were at your place but let me reassure you that this is a treatable condition and carry a good prognosis with appropriate management.
Stay relaxed. Wish you good luck.