How do you manage your emotions during a tough transition at work? E.g reorgs, changing teams, managers etc

We had a reorg recently and my entire team was disintegrated and divided, plus my manager changed without me being able to have a say. Leadership expects everyone to be excited but at the same time, I feel super low and sad, as I’m no longer going to be reporting into people I’d respected or like working with. I’d be reporting into a new person where trust is not yet established/plus we have no connection to each other.

What would you do? I’m a few months away from an important personal goal and it’s super important that I’m able to manage my emotions and get the work done despite how bogged down I feel. I’m also in charge of a really important high stakes project at work: so now I’m not only dealing with these big changes in my role/reporting structure, but also the pressure of keeping things moving on this important project (even while ownership changes are happening).

I’m feeling the pressure from:

1. Uncertainty - Will I meet the goals I’ve worked so hard to accomplish? I.e immigration in the country I’m residing in

2. Will I get on with my new manager and will we be able to progress or be able to meet our leadership teams goals on this abstract mission they’ve assigned to us?

3. How do I keep things moving as owners change on this specific project, and manage my emotions as I can no longer reach out to leaders in my team as the are no longer accountable for this project. This project could fail if we didn’t have a strong exec sponsor involved who dint understand the potential risks. My reputation could’ve on the line if I don’t deliver.

4. Workload - I already have a ton of other stuff on my plate but this main project is a very time consuming endeavour and so it’s unclear what this new role I’ve taken on will require of me.

Thanks