Hi
@viktoria, Perhaps could you tell us what insulin you are prescribed and how you have been taking it in response to your very high BSLs.
Have you been in touch with your health team/dsn/doctor? If not, please do so ASAP!!
And the following, not as health professional advice or opinion -
Others have mentioned ketones, as these once formed and in higher enough concentration reduce the effectiveness of insulin. Some glucose meters have a a special function and test strip to measure (blood) ketones. Alternatively I am not sure if chemists sell ketostix or similar for urine testing for ketones. Be aware that you would need to pass urine to empty your bladder and then test the urine passed say, 1/2 hour later to get some idea about the ketone level. (or so I remember from my diabetes education)
Sometimes I have heard diabetics stop eating carbs when their BSLs are high, but this might make the ketones worse -
please talk with your dsn/doctor about this.
Trying a new batch of insulin, avoiding use of insulin which might have beens frozen in the fridge or been exposed to temps > 30 degrees C are other measures to consider, as others have suggested.
A urine infection might not be easily detected by you when your BSLS are high, but like other infections, or a vaccination, could increase BSLs.
Best Wishes and please contact your dsn/doctor and to hospital if BSL and ketones are high, or you are experiencing general malaise and, in particular, nausea, vomiting, bad headaches, fevers, bad thirst, stomach aches, bad cough, facial pain, toothache.