Feeling anxiety

I am trying to allow myseld to feel anxiety. Despite trying to allow it, describe it, etc i still find myself coming back to: this sucks, this feels terrible, lets make it go away. I believe the anxiety arises from my catastrophizing due to a high stress job and issues with perfectionism. If i end up not happy with an outcome i second guess myself on everything and perseverate. As long as outcomes are good i dont have a problem. I am trying to find a better thought (better than you screwed up) but despite trying out things like “i did the best i could” i find myself circling back to to feeling super anxious and resisting it. Any advice?