Some light reading: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2912080/
Note in the article: “Rapid correction of the serum sodium by more than 12 mmol/d should be avoided because of the risk of osmotic demyelination”
A google of ‘osmotic demyelination’ suggests you really, really do NOT want to subject yourself to that!
If real food is not enough to provide you the results you want, I would suggest you seek professional advice from a doctor, as there could be some serious underlying conditions (thyroid, and kidney problems come to mind).