The above blog includes a candida protocol which helped to cure my own systemic candida problems(I also had tachycardia and dizziness as symptoms).
To prevent stroke and AF -- take 5% lugol's Iodine -- 8 drops or 50 mgs per day -- in split doses of 2 drops with water 4 times a day. Work up to this dose slowly. See this doc on Lugol's Iodine Use. Also take 100 mgs niacin(not niacinamde) at mealtimes 3 times a day and take B50 complex once a day with breakfast. Both these remedies will help to thin the blood safely and improves blood flow to the brain thus preventing stroke. In the old pre-WWII years there was a well known cure for both high blood pressure and cholesterol and it was called iodo-niacin(Google it) which was very successful at curing thick blood problems without any side-effects.
Your partner should also take magnesium as magnesium oil(70% magnesium chloride crystals + 30% water). You can take magnesium oil transdermally(apply it over the heart region) -- where it is directly absorbed thru the skin. If you can't find the magnesium chloride then just take magnesium citrate 500mgs twice a day outside mealtimes. This will also help his AF and stroke problems. See this link: