Roughness of throat. It because of dish?

Yesterday night i ate colocassia dish which was liquified. It was hot when i ate and little spicy. I had coughing about 3 or 4 times after that and also felt strange in throat. After that i did betadine gargles which i am continuing since about 4 days and i didn't swallowed saliva for an hour. In the morning when i drank water i felt like some roughness is there in throat and also i had dryness of mouth and it felt like the mouth is little hot from inside. When i swallowed food i had great roughness experience in throat and then i drank too much water and then i felt bit comfortable. I have allergy too in nose but only redness nothing else. It improved a bit since morning but still there is roughness or scratch type sensation in throat. Is it because of dish? And what should i do to relieve faster. I can't drink cold water as it cause cold faster due to weather here