Water questions

Hi, this is my first post here and I hope my English is understandable:-) I started to decrease my fluids some days ago and I need some help. My history is long, but I have been sick in different ways since I was about 14 (25 now). And during all this time I have had big problems with fluids. I drink a lot of water, but it just makes more thirsty. I pee all day long, always clear, no colour. Some years ago, when it was even worse, I almost couldn’t leave my house because I was so thirsty, but when I drank I hade to run to the toilet 5 minutes later. Everything I drink just runs straight through me. I have dry mouth, and when I drink water I get the same feeling as when I’m really stressed: dry mouth, fast heart beat.. During summers I sometimes drank 4-5 litres of water every day, nowadays I have been drinking around 2 litres (and a lot from food). And I am pretty small person.

Doctors said I had a smaller deficiency of antidiuretic hormone and told me to drink more water to replace, but it just makes the whole situation worse.

Some days ago I started to decrease my water intake and increase my salt intake. And I’m not sure if I’m doing this right. I’m SO thirsty, I have headache, I feel really bad. When I have eaten I start feel more thirsty. It’s ok in the morning, but after lunch I start having headache and thirst. But I’m not sure about the thirst, because I have been thirsty all day long the last years, even if I drink….so I can’t really trust the feelings. When I drink more water the urine loses all colour again.

Is this normal to feel so much worse when starting? Am I doing this right?

I eat pretty good, but I still have problems with a low metabolism and I think it’s because of all water..