Nauseous after drinking suddenly?

I hope this is allowed!

I’ve never been much of a drinker, but at the end of last year I started going out drinking quite frequently with a friend. Sometimes once a week, sometimes twice a week. We would go clubbing or bar hopping and drink most of the night. I always stop before feeling nauseous and I never drink to the point i’m stumbling/falling over.

The next morning i’d always feel fine. No nausea or headaches, just tired and maybe a bit groggy.

I took a bit of a break and only drank for occasions. Same stuff, never felt nauseous or anything.

Now the past 2/3 times i’ve gone out, I wake up the next morning and just feel nauseous. I drank quite a bit a few weeks ago (still not enough to stumble/be unaware etc. just feeling very happy and maybe a little wobbly) and when I woke up I just had this recurring feeling of nausea for around 2 hours! My drinks were the same, everything was the same! I even got hot and cold flashes. Eventually it went.

I went out a couple nights ago on a pub crawl. One cider per pub, we sat at each pub for around an hour then walked perhaps 20 minutes to the next. I ate a big meal earlier in the day too. At the fifth pub I felt pretty happy, too and on the verge of being tipsy. Then we ate some more, didn’t drink any more and walked to the next pub.

I must have stopped drinking around 8 or 9PM. Went home at 10PM, felt completely sober, stayed up chatting with my boyfriend for a little bit then went to bed.

Woke up the next morning and still got these feelings of nausea? Nowhere near as bad, but 10 seconds of feeling fine, a few seconds of feeling a little sick then fine again. I managed to go back to sleep for a couple of hours.

I enjoy drinking socially with my friends and getting a little buzzed, but don’t want to keep waking up nauseous, especially when i’ve drank WAY more and way quicker in the past and never struggled!!

Only thing that’s changed is at the beginning of my drinking (last year) I was on Contraception A. Then swapped to contraception B a few months later, and have recently changed to contraception A again.

Any suggestions? I don’t want to stop having a drink occasionally 🙁