Sadly, lab results that are "in range" will not necessarily support optimal health. Those ranges include the results of people who are very ill.
You could be right about your adrenals having taken a hit. Salt is their friend. Consider trying 1/2 tsp pink salt today, and at least 2 quarts of water. A quarter teaspoon per quart might help revive you. A sodium result of 139 6 months ago could be worse by now, or at least not much improved.