Stomachache EVERY TIME

Alright so I didn’t drink until college and for the first couple months I was unstoppable. I could get wasted and bounce back really well as long as I didn’t mix drinks that shouldn’t mix. Then it started making me sick. Like of course, you drink poison, you feel like shit. Everyone gets that. But it was an upset stomach every time for a whole day after. Nowadays (a couple years after) unless I’m drinking something like Moscato, it’s 2 drinks and then I can’t sleep and I feel sick. I have PCOS, so maybe that’s why, but idrk. Just wondering if anyone else has experienced this. It’s always a stomachache. No headache or nausea or hives or anything else. Last night it was two mules and then I felt like shit when I was trying to sleep. I feel it’s an unreasonable level of pain for how much I actuslly drink. I don’t even get more than like a casual drunk. We were sitting around a fire and chatting about normal things. Maybe my body is just weak but it wasn’t always so bad at taking it. Anyways thanks.