Hi, sorry to hear you've been having problems with control. Your earlier instincts are probably right-throw your insulin away!! I'm not being flippant, but it is not insulin, and you can look for every reason under the sun why your contol is not good, but that your most likely answer. You are taking 'analogue' insulin, which is not insulin. I went through similar experience, wondering whether it was my hormones, what I'd eaten, the wind direction, eventually I thought there was something seriously wrong with me. I'd been on 'human' insulins for 14 years and never had great control, and was advised to switch to Lantus in 2003. Within a year and a half, I was at death's door, literally, and had no consistency in control; I never thought for a moment my 'insulin' could be at fault. when it did dawn on me, a year ago, I changed to animal insulin, following some really spot-on advice frm the IDDT. A year on I'm still angry about my problems being ignored by medics, and especially having recently been told I have neuropothy in my feet.
I now have great consistent control and regret ever trusting my consultant and spending years injecting rubbish!
Do some research if you have any doubts or contact the IDDT, and all the very best.
Jus