What Can I Do About My Kids And I Still Having Sweet-smelling Breath And Frequent Stomach Aches A Month After A Stomach Virus?

My 3 kids and I had a bad stomach virus about a month ago. Everyone had a very distinct almost sweeter smell to not just their poop but their breath as well. There has been no throwing up since it first hit us, it was the normal 24 hours of throwing up when we all got sick. But everyone still has the smell even on their breath and my kids are now complaining about stomach aches frequently. I’ve been giving everyone a probiotic supplement. Is there a probiotic that is recommended or what else can I do?