water toxicity??

i usually drink about 5 -7 litres of water per day and all my life i never thought there was a problem with that except i am someone who has hyper hydrosis. recently i read an article about taking in too much water and how if can affect ur body in the long run especially pregnant women. i tried to limit it to 4 litres but i find that it makes me irritable and i tend to get dry throat when i just see water🤦🏾‍♀️. Anyone else know more about this??