Stop driving the car. When you start the car, does coolant/water (in quantity) come out of the exhaust?
The gasket is certainly gone. Get the coolant temp sensor checked. During normal operation, the needle should be around 40-45%.
For gasket, try Nasir Autos at Plaza. Has gasket been changed before? If yes, what was the condition of the block? If not, go to a reliable mechanic so that he can verify the condition of the block as well.