Thanks for your question on Health Care Magic.
I can understand your concern.
Yes, daily intake of yeast rice can cause palpitations.
You are also having palpitations with caffeine, gardening, washing etc.
So possibility of
allergy of dust, grass, yeast etc is more in your case.
And allergy can cause palpitations.
So better to consult allergist and get done allergy testing time rule out possible allergies.
If you found to be allergic then you need to avoid those things.
You may need oral combination of antihistamine and anti allergic drugs.
Don't worry, you will be alright.
Hope I have solved your query. I will be happy to help you further. Wish you good health. Thanks.