Topic: Problem with c stick in minecraft. :(

I’m new to this and tryna reach out to as many folk as possible. I’m tryna fix the problem with the c stick on my NNDSXL. It’s only just happened recently where I can’t look up. The screen pans down automatically. It won’t let me look up at all. I’ve tried restoring it in-game and then repairing it. But nothing works! ;—;