Salting your food isn't really enough. Have a cup or two of salty broth or bouillon and see if that doesn't make you feel better.

5g (5000mg) of sodium per day is what is recommended by Phinney and Volek. I think that is 2tsp. I said what it is in that thread and I don't remember right now.

There are plenty of options for salt without iodine added.

I had horrible palpitations during my first year of menopause. Found out they're a common symptom.