If you've been told you need to cut back on your sodium, you've already found out how difficult that can be. Salt is an obvious source of sodium, but you're probably getting much more sodium from other foods. Here's some help: How Do I Avoid Salt and Sodium?

If I drink a lot of water, can I wash all the sodium I’ve taken inside my body system?
Change water for prune juice and the salt will leave
Nothing can replace water for flushing. Juice contain sugar and others, suggest to flush after salty food, coffec or tea with glass of water
I thought sea salt contained natural iodine?
If I eat too much sodium (which isn’t hard to do and I’m sensitive to sodium), I drink more water and increase my potassium intake, which seems to help balance things out). Fruits and vegetables are good sources of potassium.
Awdishu – sea salts contain very very little iodine – not enough to be considered a good source. If you need iodine, iodized salt is better.