Seconding Inka's questions and comments! Especially-- when were you diagnosed?
I was diagnosed 8 weeks ago. Had to find out about carb counting, and working out an insulin-to-carbohydrate ratio, myself. (They've booked me in for a carb-counting course, but not until later this month!) On the bright side, got a Libre 2 within 10 days.
You think your peaks and troughs are bad? Over the past 8 weeks, my levels have ranged from 22 to 2.5!
But the good news is-- it really does get better. Over the past week, my levels have been 93% within range. I think this is partly due to my body getting used to having proper, regular doses of insulin again, and mostly due to finding the right insulin-to-carbohydrate ratio for me, by trial and error.
I'm still having some inexplicable swings-- for example yesterday evening I had a bizarre plunge to 2.5 (and that was as measured by the blood meter, not just relying on the Libre)-- but not nearly as many peaks and troughs as in the first six weeks or so.
So, try not to worry too much-- and do talk to your diabetes specialist nurse! Both about how to get a better grip on your levels, and about your feelings. They all know that 'diabetes distress' is common, and they can be very reassuring. All the best, and let us know how you get on!