Drink lots of water, like a gallon a day, and mind your electrolytes. I find that sucking on a boullion cube keeps the sodium about where it needs to be. Spironolactone dehydrates ferociously and can be uncomfortable until your body gets used to it.
I can't believe the military is paying for your hormone therapy, it just boggles my mind. Do they know they are or did your doc write it up as some wacky blood pressure treatment?