Hello, Palash:
I feel Your pain. It is MISERABLE. Close eye and apply ice--not constantly, but just enough to cool it off a bit: DO NOT OVER-DO THIS!!!
Better to get some sleep and have a look at my file in dropbox for IRITIS; good drug is DEPO-MEDROL don't know what this is called in India but Squibb makes something I think. Click on active link below: Important AS Resources.
Get to OPHTHALMOLOGIST ASAP!!!
HEALTH,
John