I never did a flush, but what your symptoms are they mimic when I have low sodium. What type of kelp are you taking? I take Nature's Way kelp (capsules)...I up my dose when my sodium goes low, plus I eat tons of salt(regualar Sea Salt never worked for me...I use Hawaiian Bamboo Jade Seasalt (works wonders for me). Stay away from high potassium foods for now, for me high potassium foods pushes out the sodium in my cells. I never drink salt water, but when desperate I will take about 1/8 to 1/4 of the Hawaiian Bammboo Jade Seasalt and let it disolve under my tongue.