it seems to be an acute attack of rhino-pharyngitis
As you suffer from seasonal allergies too, any change in weather or exposure to cold
might very easily trouble you.
Avoid cold foods and cool environment(e.g. AC)
Take warm saline gargle.
Take a nasal decongestant and an antiallergic tab.
You need antibiotics and anti-inflammatory drugs too.
You need to go for routine blood analysis.
Kindly consult you Physician for the needful.