Half a bottle of whiskey in one night

I drink half a bottle (375mL) of whiskey per night, 2-4 nights per week, this has been going on for 2-3 weeks, is this actually too much ? I saw posts online saying this could genuinely kill you, I wake up fine in the morning except for some thirst which goes away with some cold water, i also make sure to drink adequate water while drinking the whiskey, I need to know if this is actually a fatal amount