Hi Izzy,
I've been diagnosed for just over two years and taking levemir / Humalog. I switched from Lantus about a year and a half ago.
I have exactly the same problems as you at almost exactly the same days as you during my monthly cycle. It's taken me all this time to get to grips with it, but last month I sailed through it because, like you, I'd identified my cycle pattern. Here it is:
Day 3 / 5 drop to 4 am and 7 pm Levemir, 1:20g ratio all day
Day 10 increase to 5 and 8, 1:20g breakfast, 1:15g lunch, 1:12g Dinner
Day 26 increase to 6 and 9, meal ratios as above.
Sometimes, like you, it can be slightly different give or take a day (obviously depending on what day I ovulate im assuming).
The whole thing has caused me some real problems until I explained it all to my specialist last October and he suggested it was due to my monthly cycle. At first, i was sceptical because the shifts in required dosage didn't happen on the obvious days. However, I plotted it all out and identified that there was indeed a strong pattern. It's taken me from then til now and loads of hard work to fine tune my changing insulin needs, but I'm over the moon with myself this month because I haven't had one day out of control. I do what you do and if I get a surprising reading which I cant explain (one where I cant put it down to what I've eaten), I look at what day I am on in my monthly cycle and immediately "go to" that new dose. It's a bit of a leap of faith but its worked so well.
But I must say it baffled me for ages beforehand and looking back at various scenarios eg holidays where I was high despite reducing my carb intake and correcting, i can see that all that was happening was that I was moving through my hormonal month and needing more insulin.
I wish I'd read a posting like yours a lot earlier, as it would have been a lightbulb moment!!! So to any other girlies out there, if its happening to you its a good idea to bear it in mind if you can't understand why literally one day you are under control and the next you aren't. It might be down to those pesky hormones!! :thumbdown:
Cheers
Paula