Reverse hit

Stop hitting them? Poke check from distance or hip check. It's pretty easy to deal with. 

If you poke check from distance and they try to reverse hit. They'll just lose the puck. If you hip check them, you won't be reverse hit, and they'll lose the puck. Even using hipster for hip checks is incredibly powerful against unstoppable. 

Also, the moment they reverse hit. Have your team mate line up right behind you. Your opponent who reverse hit will lose the puck temporarily and you can just pick the puck up easy. 

I say this because I have an unstoppable build and I know how to defend against it as well. My power forward easily counters players who use truckulance.