Kefir and gut issues

Anyone a idea why kefir cause bloating/flatlulence and muscle spasms 8-10 hours after I drink it. I tried drinking kefir for a week and started with a 200 ml glass. I thought my body would get used to it and continued like this for 5 days. When the symptoms persisted, I took half of the 200 ml on the 6th and 7th day. Even then, my symptoms were the same after 8-10 hours of drinking the kefir. What could this be due to? And do i have to push through or stop?

I noticed a increase in fatique and had dark circles (eyebags) the morning after consuming the kefir.

Background: I have been suffering from intestinal complaints and dysbiosis for 2 years since covid and multiple courses of antibiotics. I have the above symptoms daily only the kefir worsens them for 2-4 hours and then it is over. Does anyone have any idea what this could be due to? Or any advice or tips?