Why does drinking a lot of water make me feel like vomiting and causes me to feel bloated?

This is because you are likely putting too much water at once into your body. Normally your stomach muscle is relaxed, but a lot of food or water being consumed in a short time causes it to have to stretch, resulting in bloating. If the volume of water you are drinking makes you feel like vomiting, it is because your body knows that too much water is coming in and wants to get it out early, as excess water can weaken muscles and nerves. The first place water is absorbed into your body is the stomach, so that's why it can be sensitive to too much water being ingested.