stomach cramps from kefir?

Ok, got a dilemma! I have been drinking about 8oz of kefir a day for about 2 mos. now with no problems until last week. I started getting severe stomach cramps within about an hour of drinking it. I also had a severe case of diarrhea for 24 hrs. after drinking it.
Well, I took a break from kefir last Wednesday until today, Monday. No stomach cramps. I had other dairy and no problems. This morning I made a kefir smoothie and bam, within an hour I had horrible stomach cramps. From what I've read (correct me if I'm wrong, please!) kefir is an acidic beverage. So I made myself some baking soda and water and drank it down. My cramps are gone.

Now, my question is, what is going on?! lol. I have never had a problem like this before and am perplexed. I have just been learning about eating better, ie. nourishing traditions and following more of a biblical based diet, so I am a bit ignorant on the effects of different foods on our bodies. Can anyone tell me what I should do? I do not want to give my beloved kefir up as it has helped me in so many ways (anxiety, weight loss, recurrent skin yeast infections). Do I have to take an antacid everytime I drink it? Is baking soda bad for you? Any help and advice would be greatly appreciated!

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