Why does getting injecting novarapid timing right to control peak when surely that bolus will kick in anyway?
Ideally one should try to smooth out spikes, to achieve a levellish BG, in range. Easy said, not so easy to do. But getting the pre-bolus timing right gets the insulin arriving into your blood as the carbs arrive, thus minimising spikes.
So, no prebolus does get insulin into your blood, but your digestion may well have done its thing, delivered the carbs and thus you spike. How long for pre-bolus is trial and error, in conjunction with experience. I find I need 30-45 minutes pre-bolus before breakfast, perhaps 20-30 mins before lunch and less than 20 mins before dinner.
You could be different, but it's all about your body's natural resistance to insulin and most people have a higher insulin resistance in the mornings, which for most people reduces as the day goes on.
The other seemingly confusing factor is that most people find their natural insulation resistance increases as their BG increases. I have worked out (trial and error) that if I'm above 8 (actual from finger prick) then my bolus takes longer to become effective. So by the time I'm ready to bolus for breakfast, I often have what is known as Foot on the Floor syndrome whereby my liver has dumped glucose into me because I'm awake and my BG has risen to above 8 from my first reading of c.6. So I need a correction adding to my bolus and often also need to wait longer than 45 mins. If I don't wait then my insulin starts to deal with the correction, but takes so long that it dissipates before it can deal with the food.
It's a bit of a nuisance but I'm retired and can afford to delay eating (no rush to get to work) and I use my Libre to guide me into when I can start eating. If I can't wait, eg have a fixed commitment after breakfast, I'll strengthen (increase) my correction and then eat when I need to, without waiting. This is more trial and error and I suggest you need to approach this cautiously to avoid sending yourself hypo.
I’ve been high for a couple weeks now, 10% in range highs everywhere. I’m injecting what I class as silly amounts for sod all carbs.
This sounds as though your basal insulin is insufficient and as a general principle one needs to get the basal about right first, then scrutinise the bolus ratios and bolus timings. Have you done any fasting checks on your basal. I am on Tresiba, which is a once daily very long-lasting basal whereas Levermir lasts under 24 hours and is often split am and pm, with changes to the actual basal dose to find the balance that works for you. I'm not best placed to advise on the finer points of Levermir.
If tou could provide a little more info about all of your dose sizes and typical "sod all" carbs per meal, hopefully we can advise a bit more specifically.
One way or the other for me it’s crazy
Yes, Diabetes can feel crazy. It's certainly complicated, confusing and contradictory (reference Gary Sheiner "Think Like a Pancreas"). Have you got this book? Do you get decent support from a hospital based Diabetes Specialist Nurse (DSN)?
I have only briefly read back into your history, but glean that you were diagnosed T1 c.June 2021, joined this forum Sep 21, had a Libre trial shortly after and been wrestling with your D ever since. It takes time, helps to have some background understanding about why so helping decide what to do, and patience for trial and error. It isn't easy, even without trying to earn a living, and you are in a very long marathon that is best managed slowly, steadily and (as much as possible) logically. Do keep asking questions, a little more info might assist; it's possibly somewhere in your earlier threads and posts, but too much to read to find it. Hope this helps.
