Stomach hurts / having to throw up when drinking, tips?

Hi, i have this weird thing where whenever i drink my stomach starts hurting and / or i feel like i have to throw up and sometimes do. I drink hard seltzers as i dont like the taste of beer and this happens even when i am drinking on a full stomach. Its also not that its too much alcohol this can happen with just one 0,5 unit especially if i chug / drink fast. What could be the reason for this and is there any way to make it go away as it really makes the drinking experience of alcohol suck.