This isn’t about being in control of everything and everyone. It is about taking appropriate responsibility and considering the level of influence you have on how you undertake your role and the way you manage your work in general.
If this is an area that is concerning you, have a look at the following resources to see where changes can be made.
Resources and Tools
You can create a plan for taking control and letting go of those things that are uncontrollable, why not have a go at Controlling the controllables.
Planning can help you put you back in control, this simple best made plans template, might assist.
When faced with a decision, it can be helpful to think through the potential impact of a particular course of action. Here is an overview of an influence diagram. It is a straightforward way of depicting the chain of consequences that your decision might invoke.
Creative thinking can help you come up with new ideas in order to solve particularly tricky problems. These Top Techniques for Creative Thinking might help get you started.
Being assertive is an important communication skill which can help you take control, reduce your levels of anxiety and improve your self-esteem. Check out this How Assertive are You? assessment to see if developing your assertiveness could be supportive.