Hi Susieg,
There is a good chance that the insulins you're on isn't working for you. What insulins are you taking? I used to be on novorapid and levemir then lantus which was HELL for me..Tiredness, foggy headed, fatigue and even had to reduce my hours of work..I still eat whatever I want ....in moderation, but I find cereals give me a high unless I increase my insulin..I'm now on porcine neutral and porcine isophane. My blood pressure is highish and vit D deficient. Thankfully, the tiredness, foggy headed etc have all gone and my strength in returning. I can now walk without having to drag my legs.
Remember that your insulin dose depends on what(CARBS) you eat, so on a low carb diet (don't go silly as food is energy)
you'll need less insulin. I just look on the amount of carbs per say 30grams. If you carb count you can then work out how much insulin to inject. Failing that, look at what you eat then make sure you're checking your BGs before and 2 hours after meals, You can then adjust the BGs , if you're high, by doing a correction dose..see your DSN if you're unsure. This is just s simple guide to carbs, but LOOK at the carb details on the packets. If I'm going to do any DIY I just have a light 'carb snack' before doing the DIY.
For me I aim for BGs around 6-9, I've tried to aim for lower but I tend to go into hypo if I start to do ANYTHING. It seems that's how my body work. I'm still learning what doses to use especially when I'm at work as it's physical. On my days off I have to use MORE insulin for the 'same' meal otherwise I end up high.
Just a thought for porcine neutral users, I find that I need to test up to 3 hours instead of the usual 2 hours after a meal. Maybe, that's ME...
Having gone through 3 years of needless hell on the wrong insulins..analogue and human insulins...check that the insulins are OK for you. Many diabetes teams try and get everyone on analogue and don't like people saying that it's giving you the 'side effects'.