Dysphoria sucks and that's something we all know. But harming yourself do it much worse. The pain and everything. So I would recommend you to talk with a gender therapist, maybe he or she can help you.
This may sound a bit cheesy, but it's anyway a tips. Grow your down stair hair so long as possible, so your genitalia isn't that visible. If your hair is light down there, you may color the hair. I may sound ridiculous... Anyway, if you has some colors, you would maybe focus more at the colored hair than the genitalia. If you has dysphoria by peeing, I recommend you to sit down and pee. Then you don't have to touch it too much. Sorry, I have no tips when you become hard.
(I know I have weird ideas. But I really hope it helps. Growth the long hair thing helps for me)