hello and welcome to HCM,
I have understood your problem and I assume from your symptoms that you have vestibulitis or swelling of the nose which can be due to infection and/ or due to a variety of causes such as temperature change and allergy
to name a few.
You need to immediately start an antibiotic like the amoxycillin-clavulanate
625 twice daily along with a pain killer like acetaminophen
and also an antihistamine like levocetrizine once daily. Your doctor will know about these.
Also do steam inhalation and hot fomentation
Your infection and pain should subside in a week. If that does not happen then you may consider injectable antibiotic and painkiller for better pain relief.
If that does not help then you must consult an ENT as soon as possible
Meanwhile please do not meddle with your nose and keep it clean
Finally do not worry as infections of the nose is very common and treatable condition with very good recovery
take care and get well soon
Dr Sriram Nathan