I use Diamond Crystal Sea Salt which works well for me. You can try any Sea Salt from the supermarket and see how it works for you.
I have low blood pressure and I think it's lower these days-- I'm more dizzy when standing up.
That does sound like low blood pressure. Do you have a blood pressure machine? I can always tell if my blood pressure is too low if I get dizzy when standing for more than 15 minutes, or if I go from crouching position to standing I get gray-outs.