@GHermann I believe its too late for you to reschedule. Your options are skip & get a no show or go & get exposure to the test.
I 100% understand how you feel right now. And I stand firmly in the "go take the test" camp. Why do you ask? Ive been in your shoes. More than once. I took the test 7 times. I did not study for 3 of those attempts. Like at all. Because of burn out and marathon training. But I went anyway and it sucked. But I came out with the diagnostic that showed me my weak points and gave me a path forward.
I highly recommend giving it your best this April. And then digging in real good this summer to smash it this fall before it goes CBT.