Unexplained highs in the late evening

Ok, back to this thread. I've been injecting Lantus since starting this thread and after three or four bad days, it seemed to get better. BG would still rise in the evening, but it took about 3u of NovoRapid to get it to normal levels. During the day, everything was perfect. Last night, disaster struck - it was 200 mg/dl at 12 am and I injected 2u of NR which I though would at least bring it under 150. But I woke up with 300 mg/dl and struggled all morning to get it to a decent level. I injected another 8u (2 by 2), not counting the 10u I did in the morning. It was decent enough after lunch and in the early evening. Now it is 290 mg/dl. It was 260 mg/dl 40 minutes ago and I injected only 2u NR to see how it would react. I just don't know what to do anymore.

Can't understand these 180 degree turns from one day to another and why on Earth insulin doesn't lower my BH....

Here I am once again dealing with the same problems. I'm still on Lantus and get highs and insulin resistance starting from 5 pm, regardless of what and when I eat. I've tried splitting the Lantus dose and I got the same results. There are days when this doesn't happen and everything works as it should, but those are pretty rare.

I've also been diagnosed with chronic sinusitis and am seeing an ENT specialist next week, but I don't think this condition could explain the glucose levels rising like clockwork in the late afternoon. I will see my doctor at the end of the month and discuss this issue again, as well as switching to Tresiba if possible. In the meantime, I am open to any ideas that could provide a solution. Thanks!