Your difficulties are real, valid, and not relative to any other person's. It's okay to have them and discuss them.
Keep watching your own brain when you can; you cannot be successful every time but you improve your brain hygiene a little bit each time you do. Sometimes you'll have to let it happen for bit of time while you regain enough energy to stop catastrophising and that's okay too. The exhaustion you get from stopping it just means you're doing good work.