Whenever I experience this anxiety, I have learned that the cure is almost always better feedback.
If I'm worried about the performance of my software, but I don't know which things to optimize, I need to use a profiler.
If I'm worried that my code changes introduce bugs, I need tests.
If I'm worried that a design isn't the best set of trade-offs, I need to share it with people whose judgement I trust and get their feedback.
I'm not a manager, so I don't know exactly what feedback looks like at your level, but I'd suggest involving more of your team and collaborating on decisions more.
If I'm worried about the performance of my software, but I don't know which things to optimize, I need to use a profiler.
If I'm worried that my code changes introduce bugs, I need tests.
If I'm worried that a design isn't the best set of trade-offs, I need to share it with people whose judgement I trust and get their feedback.
I'm not a manager, so I don't know exactly what feedback looks like at your level, but I'd suggest involving more of your team and collaborating on decisions more.