Hi and welcome. I'm sure you have already had tons of experience with this but I'll just let you know anyway, diabetes is always changing in you, what works one day may not work the next. Every little thing in life has an impact on diabetes and this is why it can be so frustrating and difficult to control. Always try your best to keep your blood sugar under control, but don't beat yourself up if it goes high or low. Many diabetics suffer with depression because we constantly feel like failures because our diabetes is sooooooo hard to control.
It's 99% NOT your fault. All we can do is keep trying.
I might add that a CGM (continuous glucose monitor) may help you to be able to prick your finger a little less often, and keep much better track of how your lifestyle and medications are impacting your numbers. You might do some research on a CGM and see if it interests you. Mine has helped me a ton.
Good luck and happy thoughts to you!