Good yogurt makes most of us feel better, unless we're lactose intolerant. Sometimes homemade yogurt can get contaminated with mold or unwelcome bacteria, usually from added ingredients.

@Scott F so you prefer the yoghurt in supermarkets not home made one. Isn’t it?  

What do you mean with the ingredients?

There's nothing wrong with homemade yogurt, and it's pretty hard to screw up. Not all cooks are equally careful with food preparation, so sometimes it gets moldy or contaminated additives/fruit/whatever are used. I wasn't suggesting that homemade yogurt is a problem, just pointing out the (very unusual ways) it might possibly cause your problem. It's more likely that something else is doing it, though, unless it's lactose intolerance.

Thanks @Scott F

I will go to dr. But I am sure I won’t eat home made yoghurt for some time. I wish I will be better. 

what options do I have with rectal ca? ad colon ca 32 years ago.. pouch reversed.. I a,m 72 years old and feel fine with pain pills. I do not want surgery nor do I think I can tolerate it

I have had problems with regular yogurt and avoid it, frozen yogurt, smoothies, etc.  I have tried lactose free yogurt ( recently bought a pack of 4 small ones) and I think they are giving me pouchitis too.

11 years with J-pouch, yogurts, Kefir and similar fermented milk product with lots of live probiotic bacteria does not work with J-pouch, it's good for people with a colon, but with J-pouch you may feel good after some hrs but after 2-3 days the bacteria overgrown in the pouch and you get burning pouchits and may have to resort to CIPRO if you can't ride out the flare