There could be another problem which needs to be checked. Check if the water pump is functioning properly and not leaking. The best way to avoid damage to the engine is to put the car into any workshop immediately. Replacement of the Head Gasket is not a very costly affair. If there are any workshops near your residence you can drive there simply by keeping some gallons of water with you in reserve and topping up the radiator when you see the temperature needle rising. But you must be very careful not to loosen or remove the radiator cap while the engine is hot. Otherwise you may suffer serious burns.