In the spring of 2011, I drank two to three teaspoons of sodium bicarbonate every day for two months dissolved in lemon or lime juice. It had to do with a stupid protocol involving "alkalizing" my body (don't ask).
The only result was that I got kidney and bladder stones for the first time ever in my life (I was 60) for about a year following.
Try greatly reducing your sodium intake and see if it doesn't help.