Hi,
I take Humalog made by Ely Lily, and it's always worked really well for me. It has much the same action as Novorapid.
When I thought my Humalog wasn't working I was mistaken-it was my long-acting Lantus causing the problem. I think the Lantus also interfered with the action of the Humalog and stopped it being effective. Sounds weird I know-but since I've changed my long-acting to Porcine Isophane I've have great control, and Humalog works as it should, every injection.
I believe Lantus is a faulty product, and doesn't work the way it claims. I've not looked into Levemir, but it may be worth u doing so.
I spent nearly 4 years thinking it was me that was the problem, it wasn't. I only wish I'd found out earlier and not risked my health. Contact the IDDT for advice.
Hope u get things sorted.
Jus