yes definitely stop all pills, especially fish oil. the jury is not out on whether this is actually good for you, it depends on which expert you believe.
high sodium foods are salt, dairy, tomatoes, veal shank, celery, seafood. try different brands of salt to see which one is best.
best to salt your food, not your water as per dr. batmanghelidj then add in supplements one by one, ditch the ones that make you feel worse.
you can also bathe in salted water.
when sodium is very low even magnesium can stress your system. but magnesium is what i'd add back in first, just at a low dose.