I can relate to sometimes being hyperfocused, but I'm not sure that it is anymore prevalent now being on medication or if it was before. People would say that I was "obsessed" about something. I think I still get hyperfocused on things that I feel people aren't listening to me about. The less they listen, the more determined I get to get them to listen. It is really a self-destructive trait because there must be some reason why they aren't listening in the first place and I rarely every get them to pay more attention. I typically drive people away because of it.
Changing jobs or any significant life changing event is anxiety producing. Sometimes the circumstances surrounding the event cause it to be more anxiety producing than normal. I always try to step back and try to realize "why" am I so focused on this thing. Most of the time I find this helpful, but sometimes it doesn't matter, it is just stressful, even if I do narrow it down to something that wasn't so obvious at first. The things that help me with this are to try and break it down and work on the things that are in my control and realize that I can't do anything about some aspects of the change. I just try to focus on the things I can work on.
It has been a while since your post. I hope you have found ways to cope.

Lee