Hi Minnie and welcome to the club no-one wanted to join.
Anxiety is absolutely normal for anyone diagnosed as an adult - and so is grief! Of course you're worried and anxious - surely anybody with a functioning brain and an imagination must be, in this situation? (I'm certain your brain functions from what you've already told us
🙂) It'd all the 'what ifs' and the 'what happens whens' that we haven't a clue about - and the stomach churning recognition that HELP! I know nothing about this - how the hell am I going to be able to cope with it?
Hence my view on the situation for you is that yes - you may well have exactly the same anxiety symptoms you've experienced before - BUT they've arisen for a completely and utterly different reason, since this situation is completely new. You yourself have attributed it to 'being the same as what I had before' - but it simply isn't, is it? The only way to get past this point, is to live with 'the beast' for a bit until you tame it, whilst simultaneously learning shedloads more about it and finding out which ways the two of you can co-exist until the join becomes impossible to detect.
I know you find it hard to believe - but it all gets easier - given time.
If anyone has a personal bereavement everyone fully accepts it's going to take them time to get over it - and being diagnosed with a chronic medical condition actually has the same effect on us. It's not just me saying that - it's fully accepted by the medical profession too - so your diabetes clinic are aware of it and will help you!
Meanwhile, Google the name of Elisabeth Kubler Ross and her 'Five stages of Grief' - eg -
https://www.businessballs.com/health-and-wellbeing/elisabeth-kubler-ross-five-stages-of-grief/ to see your way through that part.
Good luck with it!