It would / should also hit your middle finger. Is it all day or parts of it? When you use your hands or afterwards?
I notice in your post that you say you are scheduled for a Desmond day and refer to it as training, I don't know what they are like in your area but I found them unsupportive of self testing and low carb. In all honesty I believe you will get more information asking questions here. I'm lucky in that my gp and dn are up for me low carbing but neither of them are encouraging me self testing my blood, but still ask me what my results are!
I hope your Desmond day is helpful and supportive, mine was just 7 hours I'll never get back!!
As for high fats I tend to say healthy fats
Parts of it and either or... it's just really random
don't test.
I low carb with moderate fats, fatwise I stick to extra Virgin olive oil, oily fish, nuts etc. My cholesterol including my trigs went up when I eat low carb high fat, when I changed to moderate fats, cutting down massively on saturated fats it went down.
My blood pressure which was a high normal went right down when low carbing.
Without being too personal do you have any weight to lose?
If you do read up about the Newcastle diet.