I had to much water!

So I was just at an event where you need to walk a lot, I went to the super market and got a 1.25L bottle of water. I drank it by at half way I started losing my balance feeling weird laughing at everything and people asked if I was drunk?! A police officer had to sniff my water in case it was vodka? I knew I was doing it but it was pretty much involuntary and I couldn’t not do it? I drink water quite a lot on a regular basis. Oh now FYI I have a massive headache! Someone help please