Stress at work

Definitely.. I've had a few months of stress and my Hba1c has risen from 48 to 50.

Yep, it happens.
Keep an eye on your BG later in the day. A stress-based high BG sometimes uses up your "sugar supplies" so may result in a later low.

Amen. I find stress raises bgl's rapidly. I've had days where the levels have jumped from 9 to 15 over an hour.

I think it's good that you're recognising what's happening. How does work stress make you feel? And how do you react? Can you change anything?
I don't work now, but used to have a stressful job, and my diabetes was the last thing I had time for. I wish I'd given it priority. From my position of not having dealt with stress at all (!) I would advise making time to test, and discussing with your DSN how to adjust your insulin doses for the effects of stress so that you don't get so many highs.
I have never come across any advice for chasing stress with insulin - probably just because I never wanted to discuss my stress with anyone, - so I'm interested in the replies you may get on this thread.

Oh yes. A team member resigned and another came to me with a personal problem on the same day, HR were unavailable so I had to manage it on my own in addition to my usual role. BS high teens.

Just do the best to mange it and try to take a step back. X