People vary I'm sure but I can't eat oats without the problems I get from all grains (gluten containing or not). They increase my tiredness and brain-fog, and they cause bloating and joint pain. I've tried various fermented grains and they don't affect me as much, but I'm still better off avoiding them for now.
I get away with a few teaspoons of coconut flour here and there but other than that my carbs are pretty much restricted to vegetables and berries. I make porridge, rice and sourdough bread for my family and it always looks and smells so great, but anything like that has a bad effect on me within an hour sadly!