Spironolactone won't by itself do any feminizing. It will lower your T levels some, and as a side effect lower your blood pressure. At low doses this will be pretty minimal. You may need to supplement Calcium and Magnesium and since it is a diuretic, expect urine output to rise. Also since it is Potassium sparing don't use salt substitutes and don't eat a lot of potassium rich foods.
Your endo will set the proper dosage but it is usually well tolerated, even over the long term. It is very important to have medical monitoring and periodic blood and bone density testing.
I know it must be hard, but hang in there. The real world is coming to even the children of Abraham. "The arch of history is long, but it bends towards justice" MLK
Blessings,
Julie