Drink 1/4 tsp. of Sea Salt in 8 oz. of water *first thing in the morning.*
During AF, there is much less of the aldosterone hormone secreted by the adrenal gland, so the body has more problems holding on to its sodium and gets rid of it through the urine, leaving it deficient. The decompensated body literally can't store it.
Probably why you have salt cravings, if any of you do. As your AF gets better, you'll crave salt less and less.