Not necessarily; 3 grams of salt != 3 grabs of sodium. It depends very much on what the sodium content of the salt is. My kosher salt, per 1.2 grams is 480mg of sodium.
This itself might be the issue, however. If possible, go through and check your nutrient lists again, and see if the actual availability of something is too high or low.
It could also be either an issue of mixing (fiber distribution), or your body just freaking out over something new (I honestly get like this if I have egg in the morning if I haven’t had it as breakfast for more than a couple months). It might be useful to just have it as a supplemental drink at first, and then introduce it as a meal replacement later. Though this latter point should be taken with a lot of criticism and great care; ymmv afterall.
I would definitely recommend rechecking your values, though.